Condensation Around Floor Joists Basement

Other options are also available.

Condensation around floor joists basement. After air sealing insulate the joist cavities above the mudsill with rigid foam insulation board or standard batt insulation such as fiberglass. The concrete foundation to wood sill plate connection is often the source of significant air leakage. It is appealing to solve a basement moisture problem with a membrane or coating on the inside. By drying out the basement air moisture is drawn into the basement more rapidly causing efflorescence and spalling of concrete and further damage to interior finishes.

3 to prevent joist movement should i fasten the joists to the slab. Easy diy tests to determine cause of sweating floor. If the floor joists are enclosed the contractor can spray foam insulation into the space. Another source of moisture could be a leak or flood that happened on the main floor of the home.

Also the rim joists will be treated i have a bunch of 60mil epdm from a flat roof project i could use to cut a strip under each joist. Six smart rec room refinishing precautions. For example fasten treated blocking to the slab mid span and then joists to that blocking. You need at least 3 to prevent hidden condensation behind the foam.

But this barrier can never work because it can t be properly sealed around all those joists. This area is problematic for several reasons. All you need is a 16 inch piece of square shaped plastic and tape. It can seem intimidating trying to avoid mold on your floor joists and in your basement in general.

Interior membrane or coating is a temporary solution. This condition occurs at the basement or conditioned crawlspace to first floor interface and between floors. The caulking is necessary because the wood expands and contracts based on temperature and moisture. Basement condensation occurs when warm moist air comes in contact with your cool basement walls and floor.

This is why the only mold resistant way to seal and insulate the rim joist area in your basement is with closed cell spray foam. As the walls cool the warm air moisture is created just like condensation on a cold beer on a hot summer day. The most important place to air seal is along the mudsills and rim joists the wood framing members that sit atop the masonry foundation walls of the basement. The contractor would need to cut the panels to fit tightly and caulk the spaces in between the insulation and joists.