Tyvek Drainwrap 2x price of Tyvek Homewrap
Kevin_D
| Posted in Construction Techniques on
Hi Guys,
I have a quick question. I was going to use Tyvek Drainwrap on my project http://www2.dupont.com/Tyvek_Weatherization/en_US/products/residential/resi_drainwrap.html
The problem is that only sources I’ve been able to find charge literally double the price of normal Tyvek.
I mean I could literally put up two layers of the regular Homewrap for the same price. http://www2.dupont.com/Tyvek_Weatherization/en_US/products/residential/resi_homewrap.html
I’ve reviewed the Fine Homebuilding article about using furring strips https://www.finehomebuilding.com/how-to/articles/siding-with-rain-screen-walls.aspx?ac=fp
Do you guys have any experience with Drainwrap? What do you think?
Replies
What is the rest of the system?
Can you tell us the rest of the wall assembly? wood frame / sheeting / exterior siding?
depending on your exterior surface and your local building codes, you may want or need to use a drainage plane behind that surface. If so, the drainwrap may be good value as compared to typical tyvec and a strapping detail.
The basic logic is that the tyvec prevents moisture from passing into the wall, but because it is a flat sheet surface, it also holds the moisture against the exterior surface using capillary force. If that exterior surface is know to have problems with prolonged moisture contact, then a drainage plane is an important addition. By adding a drainage cavity, we remove the majority of contact between the two surfaces, and allow moisture to evaporate or drain down and out. The drainwrap is a single product that accomplishes this. and is simpler to install than many other rain-screens.
Be sure and check with typar as to the acceptable exterior claddings for the product, as well as the window and door flashing details.
Hope that helps. Cheers!
RE: Tyvek Drainwrap
Instead of Tyvek Drain Wrap you could also think about applying a Waterway Drainage mat to your exterior and just use building paper or the WWplus thats already attached to Typar. It may be a little more expensive but you will create an actual drainage plain and a real path for the water to escape. Take a look, http://www.stucoflex.com/rainscreen_drainage_mats.htm