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Last winter I built a sunroom/screen porch addition for a client. Adjacent to the addition are two large oak trees and the owners were naturally concerned that the new foundations and roof cover would do harm to the roots and water supply. So in an effort to minimize impact to the trees the plan was made so that the sunroom foundation would be block piers with no underpinning and I went to alot of trouble grading and providing positive drainage beneath the sunroom floor so that runoff from the rake of the roof would drain away. The grade slopes very slightly towards the interior of the addition so I trenched and piped for drainage through to the other side of the addition. also a perimeter drain was installed to carry the bulk of water around the addition to the back where it could drain into the yard…this area in general is quite flat with alot of clay subsoil, very thin layer of topsoil.
Now after the place has been done for a while it seems there is some kind of moisture problem, I guess,because the flooring of the sunroom, which was perfect at the time of finishing, is cupping.
There is about 16″ from the ground to the bottom of PT joists, the floor has fibreglass bat insulation with vapor barrier to the bottom side of 3/4 T&G ply subfloor. oak flooring was nailed to the subfloor with a layer of 15# tar paper beneath…..polyurethane finish.
I’m looking for a solution to the problem…thinking perhaps I should put a layer of poly on the ground, and or add some additional sheathing to the bottom of the floor joists…..
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Last winter I built a sunroom/screen porch addition for a client. Adjacent to the addition are two large oak trees and the owners were naturally concerned that the new foundations and roof cover would do harm to the roots and water supply. So in an effort to minimize impact to the trees the plan was made so that the sunroom foundation would be block piers with no underpinning and I went to alot of trouble grading and providing positive drainage beneath the sunroom floor so that runoff from the rake of the roof would drain away. The grade slopes very slightly towards the interior of the addition so I trenched and piped for drainage through to the other side of the addition. also a perimeter drain was installed to carry the bulk of water around the addition to the back where it could drain into the yard...this area in general is quite flat with alot of clay subsoil, very thin layer of topsoil.
Now after the place has been done for a while it seems there is some kind of moisture problem, I guess,because the flooring of the sunroom, which was perfect at the time of finishing, is cupping.
There is about 16" from the ground to the bottom of PT joists, the floor has fibreglass bat insulation with vapor barrier to the bottom side of 3/4 T&G ply subfloor. oak flooring was nailed to the subfloor with a layer of 15# tar paper beneath.....polyurethane finish.
I'm looking for a solution to the problem...thinking perhaps I should put a layer of poly on the ground, and or add some additional sheathing to the bottom of the floor joists.....