One of the very first questions asked about sealing a crawl space is, “What about termite treatment?” This really is in reference to annual inspections for termites and treatment of bases when signs of termite activity are clear. Addressing this situation is particularly essential for residents in the southern parts of the U.S. where subterranean termites are such a trouble.
Building Techniques – An optimally sealed crawl space requires some construction techniques to be executed to reduce the chance of termites accessing the floor system of a building. Among the long time hindrances to these pests has become the termite shield, and it has. The shield is before the ground framing is done, a metal sheet that’s placed over the top of the foundation blocks. It can’t be penetrated by termites as long as nothing punches a hole through it.
Provisions should be made to seal around those penetrations if embeds are in the blocks for bolting the mud sill on the top. The termite shield endeavors past the concrete block below the building, so go across the shield to get to the wood and they’d have to crawl out of the block once termites make their way underground to the block. Yet, termites have no urge to exit a damp and dark environment and expose themselves to the light.
Crawl spaces are handled in one of two manners: Alternative #1 – Vented – A thick poly film is placed loosely on the crawl space “flooring” to prevent moisture from rising and entering the dwelling. Foundation vents are installed to help remove moisture that escapes through the poly, and insulating material is applied to the underside of the flooring above. Difficulty – Inspections in vented crawl spaces revealed damp conditions, moist floor framing members, and wet insulating material.
This presented a possibility for mould and mildew, rotting wood, and termite infestations. Solution #2 – Sealed – Trouble – Dearth of ability to inspect for and treat termite infestations. The insulating material of the base walls utilizing the strategy that is sealed is less costly and more energy efficient than putting insulating material on the flooring’s underside over the crawl space.
The ineffectiveness is even more thus using the vented method because a continuous thermal barrier cannot be created in the event the floor is built of open web trusses. Sealing a crawl space means placing a hefty polyethylene film that completely covers the soil and running it up the interior crawl space foundation blocks to a level that is at the outside of the building above the grade of earth.
Afterward an insulation board is set on the foundation and sealed to prevent any moisture from entering the building. The sealer may be a spray-applied type of cellulose insulation containing a borate additive that also serves as a nonhazardous termiticide. Many dwellings use the Sentricon bait system for added protection. This operates by putting wood products in particular tracking stations that have slow temporary termiticides in them.
Foraging termites take them back to their colonies and find these food sources. The poison really has the possibility to wipe out whole colonies of termites. Sealing a crawl space does present a concern concerning the capability to inspect for and treat termite infestations as opposed to vented crawl spaces where the base walls are simpler to reach. Stopping off the ground cover 6″-8″ below the mud sill to create a termite inspection strip.
Injection of the termiticide through the ground cover using a specialized nozzle use technique. The holes produced by termiticide injection are not a breach to the sealed space in the event the procedure is accurately performed. By using spray cellulose insulation reducing termite accessibility potential treated with a borate additive that functions as a termiticide.
Executing a termite bait system like Sentricon. The reduction in moisture going into the energy savings together with the dwelling possible makes sealing the space under a house a better option than the older philosophy that was ventilated as long as the process is performed properly.
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