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KevinC

06:48PM | 05/06/05
Member Since: 05/05/05
2 lifetime posts
Bvhvac
I want to lay a new cottage floor over an older porch floor, and at the same time raise the level 1-1/2" to align with adjacent room. The old floor is quite solid, smooth and moisture-free. Is there an insulating type board of approx 3/4" thick that I can simply lay down then fasten the new 3/4" plywood floor directly through it, without need of strapping? Do I need VB? I posted this same question under flooring, but think it's more related to insulating.

bravey

11:26PM | 05/18/05
Member Since: 06/23/04
162 lifetime posts
I assume that the porch is closed-in otherwise it may not be wise to level the porch with the inside floor.

Concerning the insulation, the best for this application is styrofoam. Many people will opt for urethane insulation board to save money. Both will work, styrofoam is the better quality material.

Be sure to lap the joints between the insulation and the plywood. To minimize creaking, you should try to screw through the insulation and porch decking and into the 2x framing supporting the porch. Finding screws with smooth shanks that long may be a problem. Try mcfeelys.com for a huge assortment.

Regards
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