With my many years of construction background of building homes, I along with many other home builders and remodelers, know the value of building a strong home. Here in the southeast Houston Texas metro area we have a good amount of wind and with our being so close to the coast, we are also vulnerable to hurricanes.

Wind Racking Force on Homes

There are two forces a homeowner should be concerned with, or should I say, anyone that lives in wind-prone areas of the USA. One is “uplift force” and the other is “racking force” from shear wind blowing directly at any home or structure.

US Department of Agriculture

The Forest Products Laboratory (FPL) is the national research laboratory of the United States Forest Service, which is part of USDA) US Department of Agriculture). They do extensive research on timber and building studies. They have published a study where plywood or (osb) was added to the outside walls of the studs of any structure. The FPL (Forest Products Laboratory) study noted an at least 300% gain in stiffness in stopping any racking force from excessive wind.

National Oceanic and Atmospheric Administration

The National Oceanic and Atmospheric Administration (NOAA) is a science based federal agency within the Department of Commerce with regulatory, operational, and information service responsibilities with a presence in every state of the country and territories. They also have done a study on ground level based shear wind or wind shear and noted the forces and pressure.  When NOAA was asked, What is wind shear?, they answered, “a change in horizontal wind speed and/or direction with height. Also known as microburst. They are short-lived, ground-based, small-scale event and associated with thunderstorms”. Yep, that would be Texas weather!

Racking Force due to Wind Shear

We will be talking about Racking Force to a home due to Shear Wind in this siding post because it is a concern many homeowners should be aware of. Right around the year 1999 here in Houston Texas many homeowners were being pitched and marketed to move away from vinyl siding and installing, in its place, fiber cement siding.

The installation of this fiber cement (Hardie) siding product often meant removing the old wood siding, stripping the OSB or  plywood sheathing down to the studs and installing the installation of the new fiber cement product. In the photo below, you can clearly see how builders across the country will often build diagonal “let-in” bracing (per the green arrows in the photo) into a home to help combat the racking force caused by shear wind.

Single Wall Construction – Non Wind Areas

Single wall construction is when the siding is applied directly to the studs without any sheathing like OSB or plywood first. Single wall construction with fiber cement siding is perfectly fine for non- wind/non-coastal areas of the country as displayed in the photo below. However; for high wind areas, more than diagonal “let-in” bracing is needed as per Texas Department of Insurance TDI TDI Wind department hence, double wall construction with OSB or plywood sheathing is required to be installed before siding for added strength.

Let In bracing “diagonal bracing” a home helps combat the racking force caused by shear winds in Houston TX

Double Wall Construction – Wind Prone Areas

The best practice of using the diagonal bracing will help stop any home from racking (tilting) when strong winds are blowing. Builders will often install OSB or plywood over these outside walls by nailing them to the exposed studs as can be seen on the left side of the diagram below labeled “Wind Areas/ Houston Double Wall Construction”. Once the OSB or plywood is installed, the builders install siding over that plywood layer. By having this base layer, consisting of some sort of  LP Oriented Strand Board (OSB) or plywood sheathing attached to the the studs of any outside wall, gives the home increased strength and shear wind resistance to combat racking force. This method is called “double wall construction“.

Fiber Cement Hardie Not for Single Wall Construction

Coming from my many years of experience from using and knowledge of fiber cement, I have found it to have very little material structural strength and it can break easily. The product offers little structural support (if any) to the outside of a home and can in fact be a liability. Don’t believe me, but try taking a hammer and moderately hitting the Fiber Cement siding, and see for yourself how easily it breaks and crumbles to the ground. I was in shock back in 1999 in Houston Texas as I observed (even participated in) siding contractors removing lap wood siding and T-111 vertical siding ultimately affecting the structural value which had been an asset to the home. This was then replaced with the installation of fiber cement which without installing any OSB or plywood, offered nearly no structural value.

Movement of the home can cause cracking of the fiber cement siding.

The image on the right is of a home I received a call on that was a “call back” from an installation by another siding contractor who had removed the old wood siding and did not install any OSB or plywood under the newly installed Fiber Cement.

The result was that the home moved causing cracking of the fiber cement allowing water intrusion and causing other problems.

This Houston TX homeowner will continue to have movement problems until all of the fiber cement siding is removed and some sort of structural grade of sheathing is installed like OSB or plywood.

Keep in mind that this homeowner paid over 14k for a siding job that was done incorrectly. In Texas, homeowners often experience movement in their homes, this is yet another reason to install OSB or plywood sheathing before any fiber cement siding is installed, hence, the method of installing double wall construction will add more stability to Houston TX homes.

The best way to build strength into the exterior of the walls is with double wall construction.

How to Install Double Wall Construction

The diagram below shows how to correctly install the layers (sheathing like OSB or plywood – double wall construction) prior to installing the fiber cement siding. This will help increase any home’s structural value for both shear, racking force wind and any settling movement providing increased strength to the exterior walls of the home.

Keep in mind that this is a much better re-siding approach for homeowners when removing old structural grade siding and installing fiber cement siding in its place.

LP SmartSide Siding Best for Single Wall Construction

This is the best way to build strength into any outside wall for homes in coastal areas that are going to be sided with fiber cement siding. LP SmartSide is wood base and has a lot of what wood works calls structural value to it that fiber cement siding does not have any structural value.

Keep in mind that if you do choose to side your home with single wall construction, a propelled airborne object could quite easily come right through fiber cement siding, the insulation and sheetrock and enter your home!

When building or if you are re-siding your home and it has no OSB or plywood under the siding, single wall construction, I recommend using the LP SmartSide Siding due to its proven brute strength. This siding will be an Asset to the integrity of your home’s exterior walls and will help keep those that you love safer inside your home. You do NOT need to install OSB or plywood sheathing before installing the LP SmartSide product and racking force from shear wind becomes much less of an issue due to the increased strength of the exterior walls. LP SmartSide Siding actually takes the place of OSB or plywood and provides much structural value and looks great too.

The must-see video below explains clearly what this means for your home. Fiber cement siding, is a great siding option, however; please insist that your siding contractor install double wall construction with OSB or plywood first for the what Wikipedia calls structural integrity of the building.

The moral of the story is this:
Fiber Cement Siding Installed on Single Wall Construction = a Liability.
LP SmartSide Siding Installed on Single Wall Construction = an Asset.

~Greg Kapitan (Kapitan the Siding Man)

Featured Video: Demonstration of LP SmartSide vs Fiber Cement Durability

Free Estimate Hardie or SmartSide

I get asked this question often working Texas Home Exteriors, “Greg, what is better, Fiber Cement/HardiePlank Siding or LP SmartSide Siding for my Houston TX home?” As we move into 2014,  I have already found myself being asked this question more and more. I respond with information based on my research, experience installing the two building products as well as discussion with other professionals.

The information in this article, I am offering based on many years of experience in the Houston Texas southeast Texas metro area and as the owner of Texas Home Exteriors. In this post, I will cite information from some of the most powerful resources I know of on the internet presenting their accumulative input including Google Books (James Hardie), Wikipedia (James Hardie) and Wikipedia LP (Louisiana Pacific SmartSide) These are sites and resources that you can and SHOULD check as well to learn more and research what people just like you and me are saying around the country and world.

So having said that, below I present the good, bad and the ugly so you, as a Houston Southeast Texas homeowner, can make an informed and intelligent decision. I encourage you to click on the links as well and doing some of your own research. After reading this Hardie vs. SmartSide Siding article, please take a moment to voice your opinion or share additional information below the estimate form.

Here are our findings

Both Fiber Cement (Hardie)  and LP SmartSide Siding are outstanding and quality building products. They both exhibit excellent qualities in their performance and longevity as excellent siding product choices for your home’s exterior. Keep in mind that each has great qualities as well as some not-so-great qualities I will point out based on my many years of experience in home exteriors here in the Houston southeast Texas area in using both products, (fiber cement – LP SmartSide Siding) and research I have done on the products and their overall performance.

Supporting evidence GOOGLE search 

When being asked about one siding product vs another, one might share their opinion from their experience, of course this is OK; however, I will also provide examples of what others are saying from around the country.

Fiber_Cement_Siding_Defects – Inspectapedia …. read more

Problems with Fiber Cement Siding installations – Structuretech1 Forums….. read more

Fiber Cement Problems – Inspectors Journals Forums….. read more

Smart Side Siding JLC Online Forums…. read more

LP SmartSide Siding vs Fiber Cement – Hot Spot Outdoors Forum….(read more)

Fiber Cement/HardiePlank- 15 Trim 30 Yr Siding Warranty

Click – 30 YR Warranty

As you can see from exploring the links above, there have been some issues reported from around the country. Fiber cement has become more and more popular since the late 1990s in re-siding as well as in new construction throughout North America.

The reported issues range from cracking and flaking paint to installation problems as well as other issues with the fiber cement siding product. The siding most often used siding product in America is fiber cement. Many of the problems with this product have stemmed from the improper installation of the fiber cement product however; there are also some issues to be aware of that actually stem from fiber cement product failure itself.

 LP SmartSide Siding – 50 Year Trim 50 Year Siding Warranty

Click – 50 YR Warranty

LP SmartSide has also been around since 1997, I have done extensive research via the internet and have not found nearly as many, or for that matter, any issues reported with this product at all, no reported problems, even LP SmartSide reports there have been no claims on product failure of the the LP SmartSide Engineered Wood Siding Products in the past 14 years it has been being installed on homes.

In all fairness, I will share that there was an issue I came across in regards to Louisiana Pacific (LP) and their OLD Product, called “Inner Seal” which has since been discontinued, this was a pre-1997 SmartSide product that failed, recalled and any claims paid responsively and quickly, very impressive on the part of Louisiana Pacific. In my opinion, this product should not have been used on homes in areas of the country that receive a lot of precipitation, thus the failures. (Note, that the “Inner-Seal” siding did very well in other areas of the country that are more arid and the product continues to stand up well in those climates to this day).

Louisiana Pacific SmartSide Wikipedia info

LP SmartSide:  (LP) “Two years after the first suit, LP had settled all related disputes. LP re-engineered the product, now marketed as LP®SmartSide® and since 1997 has sold approximately 3 billion square feet of SmartSide siding with no warranty claims for fungal decay.” This was reported on Wikipedia in 2014 of this product that has been around since 1997.

Fiber Cement (Hardie) Wikipedia info

Fiber Cement: per Wikipedia, “Fiber cement siding (or “fibre cement cladding” in the UK and Australasia) is a building material used to cover the exterior of a building in both commercial and domestic applications. Fiber cement is a composite material Fiber cement is a composite made of sand, cement and cellulose fibers. Read more about Fiber Cement by clicking on the link at the top of this article which will take you to Wiki and Build Direct FAQs.

The Silica Dust Issue – New York Times 

Both the Fiber Cement (hardie plank) and LP SmartSide siding products will produce dust plumes when cutting the product. LP SmartSide siding is wood based and makes less dust as opposed to the Fiber Cement that contains Silica. Having said that, the Silica is a much finer dust and gets airborne and tends to make billowing clouds of fine dust that can be dangerous for workers to install if respirators are not used. Here is a recent article from the New York Times about silica dust exposure that you should be aware of on this issue.

Crumble a Plank Anyone?

Click Image- Read The Rest Of The Story

You have to see this to believe what is happening. After Hardie Siding (fiber cement) has been up for a while, homeowners have been reporting on how that their lawnmowers wheels had bumped the lower run of the siding and broken off edges with some mild unintended impacts.

If you click on that link, you will clearly see what homeowners across the country are reporting as well as the phone calls that we are receiving on the issue here at our Texas Home Exteriors office.

You will also see how SmartSide Siding is much more resistant to the same impact of objects such as lawnmowers, baseballs and the everyday accidental impacts that most homeowners experience.

Benefits Fiber Cement/HardiePlank Siding Products

Fiber Cement has the upper hand by far in the category of Fire Resistance so if you are looking for a siding product that specifically is more Resistant to fires Fiber Cement is the better choice. Fiber cement is one of the most resistant materials there is for your exterior.  If installed properly, it is insect-proof, because it offers no food source to insects.  It is fire-resistant, moisture-resistant, and is not prone to warping or cracking, thanks to the cellulose fibers which boost its dimensional stability.  And manufacturers offer a variety of pre-painted colors to choose from.

Disadvantages of Fiber Cement Siding Products

Fiber Cement is much heavier than other siding types and requires two or more workers to install a single plank increasing labor costs. Fiber cement siding can also be difficult to work with, as workers cut the material it creates silica dust plumes that can be harmful if breathed in.

Benefits of LP SmartSide Siding – What the crews are saying about installation

• Length – With Longer planks” 16’ foot vs 12’ allowing workers to cover more with one plank and less joints to finish.
• Lighter – The product is 39% lighter on average, the material does not break when being carried or moved. 
• Damage – Hammer marks don’t show up easily to to it’s impact resistance.
• Cutting – No special saw blades or equipment is needed (no need for $100 special blades, regular wood saw blades work just fine)
• Nailing – No nail gun pressure issues or need to lower presser due to overdriven nails. 
• Dust- Much less dust than the fiber cement product, silica plume issues gone.
• Strength – Installation of this product helps keeps walls strait”, stronger siding provides support keeping walls straighter.
• Installers like working with the product more due to the reasons above.

Disadvantages of LP SmartSide Siding

SmartSide siding is constructed of wood base fibers, leaving it vulnerable to fire from combustion and or through the melting of the resin add-ons when exposed to high heat. If fire resistance is a concern I would consider the James Hardie (hardiplank) siding over the LP SmartSide siding. You should take a moment to read this article about James Hardie Siding and it’s superior resistance to fire.

Louisiana Pacific and NASDAQ Stock Jump

Just as resent as May 18th of 2015 the stock for Louisiana Pacific (LP) LPX has seen an 52 week all time high is stock increase due to consumer interest and sales increase in the LP SmartSide Siding Product. This has been exciting news for some time as contractors are liking having a choice to present to homeowners besides fiber cement.

Conclusion

Greg Kapitan (the siding man) Texas Home Exteriors

Well there you have it, the good, the bad and the ugly. Both the Hardiplank and LP SmartSide Siding products will serve your home will and keep your love ones protected from the weather for many years to come.

While there are differences and benefits to both siding products, we have noticed a shift in homeowners moving towards the LP Smart Siding due to the many benefits over Fiber Cement (Hardie).

What you have read above is from an article I wrote. You can find more information on our website Texas Home Exteriors – Houston TX about home siding options and you can also learn more about silica dust and it’s affects.

I hope that you have found this informative article most helpful in making a siding choice for your home exterior. Should you have any questions my email addres is, greg@texashomeexteriors.com or if you would like a Free Estimate from Texas Home Exteriors call, 281.919.6999 anytime.

Most sincerely,

Greg Kapitan (the siding man)

Free SmartSide or HardiPlank Estimate:

Southeast Houston TX homeowners often remove their old siding and install James Hardie Siding. This is a great decision for the longevity that fiber cement offers. Although often overlooked by most siding contractors, is what can be done before the new HardiPlank Siding is installed to improve the energy efficiency of the home. By adding a reflective energy efficient vapor barrier such as Dupont Tyvek ThermaWrap, this will help in utility bills with it’s added increased R and reflective values. Below I explain and provide some suggestions.

Your Texas home exterior walls can account for 40-70% of the solar heat gain and/or loss of your home. This varies depending on many factors such as the amount of sun exposure to walls, shade and the type of building materials your home was built with. Often I notice a job sign of a contractor doing a siding job and I see no roles of the Tyvek product delivered to the jobsite. When the siding is removed and there is no extra insulation existing with any level of R-Value such as Home Wrap being installed on the home, this is the perfect opportunity to install the Tyvek product while the siding is off and being replaced.

The Perfect Time to Install

Something to think about, when you have your old siding removed, this is the best time to improve the energy efficiency of your Texas home, don’t you say? I would think that the immediate answer would be yes! When you have your old siding removed, this is absolutely the perfect time to install Dupont Tyvek ThermaWrap. What this product will do for your Texas home is to push the unwanted HEAT Back Out of your home in the Texas Summertime and push the HEAT back INTO your home (prevent it from escaping) in the Texas wintertime. This in turn will save you money year round and reduce your Texas utility bills every month by having your Heat/AC unit run less now that your home is more energy efficient because the Tyvek ThermaWrap is stopping much of the heat gain/loss!

Energy Efficiency Performance under Your Hardie Siding 

Tyvek ThermaWrap is a low emissivity (Low-E), metallized weather barrier that will actually increase the effective and total R-value of any wall systems, to help improve energy efficiency in our Texas homes. DuPont Tyvek ThermaWrap is made with a metallized, low-emission (low-e) surface that reflects solar radiation away from our Houston Texas metro area homes. Cold weather in Texas, this will help stop radiant heat transfer and loss from within the home. In the summer weather, Tyvek ThermaWrap do the opposite by reflecting warm air back out and away from our Texas homes, to help improve air-conditioning (A/C) efficiency. In all of our Texas seasons, that can help make our homes much more comfortable, more energy efficient, and less costly to operate. No more Hot and Cold rooms and the home has more of an even temperature.

R-2 Plus Helping Block Air Infiltration and Exfiltration

ThermaWrap has the ability to help increase the effective R-Value of a wall, Tyvek ThermaWrap is also an excellent vapor permeable air and water barrier, like all Tyvek materials. The low-e surface changes the dynamics of radiant heat flow across the entire wall system.

Nearly two-thirds of the total heat lost or gained is through our Texas homes occurs through radiant heat flow. Tyvek ThermaWrap addresses this by helping to dramatically improve the effective R-value (resistance Value) of the wall system. This is highly effective at reducing heat gain when the weather turns hot here in Southeast Texas for over 6 months. Tyvek ThermaWrap is ideal for our Southeast Texas weather.

Reduce Texas Energy Bills – How It Works

Radiant Heat

Radiant Heat flow occurs when heat is transferred from a warmer object to a cooler one by electromagnetic waves and natural heat flow. These waves do not need to pass through air and they do not require any contact between the two materials. They simply cross empty space in exactly the same way as the heat of the sun, which
can be felt on cold days. Tyvek ThermaWrap incorporates a low-e, metallic surface that changes the radiant heat flow dynamics of the entire wall system. In winter, it reflects and or pushes radiant heat back into the wall system. Texas summer time,
ThermaWrap reflects the outside solar radiation away from the wall system, to reduce unwanted heat gain into our Texas homes in southeast TX. The total overall effect is an overall total increase in the effective R-value to the entire wall system.

When installed, Tyvek ThermaWrap adds an effective R-value (thermal resistance) equal to R-2 (R- Value). In Texas homes this can help reduce energy usage and costs for heating and cooling systems, year-round. This is a huge plus for southeast Texas Homeowners in the Houston, Spring The Woodlands metro area.

Free Tyvek Estimate Form