Envelope Analysis – How to start Sure Your Walls Won’t Rot
Moisture can be a nightmare for builders. It’s always wanting to leak in. wick up. or infiltrate into a building and with moisture comes rot and mold cheap canada goose chateau coyote-trim parka .
To ensure our new building’s walls would avoid moisture problems we did what is called an Envelope Analysis to look at the moisture conditions within the envelope (wall and roof systems) of our building.
We hired a consultant who used WUFI software to model conditions in our walls canada goose chateau coyote-trim parka . The model includes our local climate data and a model of our HVAC system. as well as estimates of how our building will get used canada goose chateau coyote-trim parka for sale . occupancy rates. how many meals cooked canada goose chateau coyote-trim parka . showers taken real canada goose chateau coyote-trim parka . etc.
Our wall system is not typical as it includes both a stick frame with blow in cellulose and strawbales. Luckily someone had already figured out the moisture properties of strawbales and published it online.
The good news is that the model showed that in general our wall system will be free of moisture problems canada goose chateau coyote-trim parka . The strawbales showed no accumulation of moisture canada goose chateau coyote-trim parka inexpensive , real canada goose counterfeit cbc . with moisture declining over time with some seasonal variation canada goose chilliwack bomber toronto online store , canada goose in london store online . Our roof system canada goose season manitoba on sale . a more standard system with metal roofing and blow-in cellulose also had no moisture problems.
The challenge is that our kitchen and shower areas could have problems with moisture in the cellulose if we don’t add a vapor barrier or do something to control humidity levels to below 65% relative humidity canada goose chilliwack down parka boysu for sale .
It’s probably possible for us to keep our humidity lower through mechanical ventilation (ie range hoods and venting for the dish sanitizer in addition to the whole house HVAC systems). But prudence would suggest that it’s best to design a building to survive even if the humidity does stay high, ou acheter canada goose france .
The modelling software showed that if we add a 5 perm vapor barrier behind the drywall in the kitchen and bathroom we should be able to avoid any moisture problems canada goose sydney hoody outlet online . Another alternative would be a 1/2 inch layer of XPS (extruded polystyrene) foam board behind the drywall canada goose chateau coyote-trim parka .
Now we’ll have to search for an LBC compliant vapor barrier but hopefully we’ll find something that works for us.