Does your siding breath?

June 11, 2014

If not, it should. There are two typical siding installation processes here in the Northwest, Rainscreen and “vented” rainscreen. Rainscreen is a siding installation process which allows the water that can get behind the siding, to drain out, with the help of a “drain wrap” house wrap, at the bottom near the foundation. Which is an improvement to old methods because it isn’t a question of whether water will get behind your siding, it ‘s what is it going to do when it gets there. However, vented rainscreen is a system that allows the siding to breath by installing the siding material on top of furring strips of apx. 3/8” – 1/2” in thickness and providing venting gaps at the bottom course and at the eave.

wood-with-labels_lgThe reality is wall systems used to breath. A lot. Older homes were not built tight so air flowed in and out which allowed them to breath. However, when your entire home breathes on it’s own, your home will be drafty and you have no control over your energy usage and indoor comfort. So, as the homes have become tighter, we have had to find ways to mitigate the tightness with the good ventilation that has an effective purpose. At Marnella Homes, every home we build has a vented rainscreen siding system. We feel this is a superior system to the drain wrap method, due to the fact that it does not rely on gravity and tiny water channels to get the moisture to eventually drain out (you hope). It allows air to circulate behind the siding to more quickly dry out any moisture that finds it way back.

It is my belief that as the siding manufactures press for this method of installation, it will be seen as the minimum standard for siding installation in the years to come. It is already a requirement on most commercial applications.

Another benefit besides the drying of moisture is that siding will retain paint and sealant longer due to the siding material being allowed to stay dry. If the siding material is continually wet it will become more difficult to adhere too. So, an added benefit to this system is reduced maintenance.rainscreen

So, if your builder isn’t installing siding this way, ask him why.   The reason is usually because they don’t believe in it or think it is too expensive. Do your research and you will see that having to tear off siding to repair rot is much more expensive than installing the correct way the first time.

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