Building Homes or Extensions/Cantelever insulation

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Expert: - 9/30/2011


Question
Hi: We have a 5-6 foot extension at back of house which is about 3-4 feet above ground, no foundation. Had issue when hardwood floors buckled in M/B. had to repair but beneath floor was very damp. We had spray foam installed(under extension)  2 years ago for better floor insulation and have been told that the joists should be completely sprayed as moisture will go up through wood. Is this true and should I have joists completely sprayed (now only about half way covered between joist). Live in Ontario Canada. Thank you.

Answer
Hi Michael, it wouldn't hurt. But you should at least cover this extension with either hardi panel cement board or pressure treated plywood over house wrap to enclose the bottom of your joists to keep the moisture out completely.I hope this info helps please feel free to write again regarding this or other matters, sincerely Bruce Johnson..bejohnsonconsulting.com  

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Bruce E. Johnson

Expertise

I can answer any construction related question in regards to carpentry, concrete, drywall, masonry, structural elements of any type of building, residential or commercial. Interior or exterior.

Experience

Custom Commercial and residential buildings. Churches, theaters, schools and auditoriums. Most recently I am working with the Catholic Church on several design build committees. I have a website related to scheduling and project supervision. Although my expertise is more related to multimillion dollar commercial, educational and theatrical projects my generous credentials in residential and remodelling construction make me a viable source of information regarding all forms of building questions.

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