Crawlspaces

Crawlspaces with poor insulation and vapor barrier can lead to a number of detrimental issues including poor indoor air quality, uncomfortable living spaces above the crawlspace, increased heating and cooling costs, musty odors, mildew, mold, and pests (bugs, rodents, snakes, etc).
Triangle Radiant Barrier can fix these problems with a variety of options to suit your needs and budget

 

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Semi-sealed crawlspaces


A Semi-Sealed Crawlspace offers many of the benefits of a fully sealed crawlspace but at a much lower cost.

 We start by installing polyethylene vapor barrier to the crawlspace ground. We install white 10-mil (option for 12 and 20 mil) heavy duty vapor barrier (much thicker, more durable, and better performing than 6-mil vapor barrier, a cheaper barrier allowed by code). We set it in place with heavy-gauge galvanized liner staples, roll-up 6"+ on all piers, roll-up 3"+ on the perimeter wall, and tape all piers and seams.

We then install CrawlBarrier® to the crawlspace ceiling: stapled to the underside of the joists (or trusses), form-cut around utilities, and all seams taped with radiant barrier tape.

CrawlBarrier® is made with two layers of non-perforated Radiant Barrier foil laminated to layer of air-bubble. The Radiant Barrier and dead air in the air bubble make for a thermal insulator exponentially better in performance than traditional fiberglass insulation. The air bubble layer also make CrawlBarrier® a full moisture and vapor barrier.

By installing CrawlBarrier® to the crawlspace ceiling, we create a full thermal / moisture / vapor barrier that seals off the living space above from the crawlspace...hence "semi-sealed".

The existing fiberglass insulation can either encapsulated by the CrawlBarrier® or we can remove it and haul it away prior to installing theCrawlBarrier® per customer preference or if it is no longer viable.

This option can remain a vented crawlspace, with the foundation vents left open to allow airflow, or we can partially seal the foundation walls (seal the foundation vents with foam board and spray, seal utility penetrations in the exterior wall with concrete patch, insulate and air-seal the crawlspace entry door, etc) and add dehumidification and an environment sensor to assist in monitoring the ongoing crawlspace temperature and relative humidity.


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Fully Sealed Crawlspaces with spray foam


A fully sealed (also known as "encapsulated") crawlspace provides the best ability to moderate the crawlspace temperature and relative humidity but sealing the crawlspace from the outside, making it part of the thermal and pressure boundary of the home.

This option starts with removing and hauling away the existing fiberglass insulation. We then air-seal the subfloor which separates the living space above from the crawlspace by sealing all penetrations with foam spray. New polyethylene vapor barrier is installed on the crawlspace ground: 10-mil (option for 12 and 20 mil) heavy duty vapor barrier set it in place with heavy-gauge galvanized liner staples, 6"+ roll-up on all piers, 12"+roll-up on the perimeter wall, and tape all piers.

We then seal with crawlspace with 2" closed cell spray foam applied to the crawlspace exterior wall and rim joists. The still plate and 3" below the still plate remains exposed for future termite inspections.

Once sealed, a means to condition the air is required. We install MegaDry® Crawlspace Dehumidifiers for this purpose, as they are of high quality and specifically designed for this purpose. The MegaDry® system is properly drained to the exterior. The crawlspace entry door is insulated and air-sealed. Lastly, we install a thermo-hygrometer with a wireless sensor hung in the crawlspace and a base unit provided so that the homowner can monitor crawlspace temperature and relative humidity, which optimally will remain below 60%.

A fully sealed crawlspace allow an environment that is clean and not conducive to high relative humidity. This precludes corrosion and the growth of mildew and mold. As the air is now clean in the crawlspace, the indoor air quality in the living space above is correspondingly improved. With the temperature in the crawlspace also moderated, the living space will feel more comfortable while the homeowner enjoys improved energy efficiency. On average, a sealed crawlspace will save a homeowner about 10% on their heating and cooling costs.


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fully sealed: rigid foam board

A fully sealed (also known as "encapsulated") crawlspace provides the best ability to moderate the crawlspace temperature and relative humidity but sealing the crawlspace from the outside, making it part of the thermal and pressure boundary of the home.

This option starts with removing and hauling away the existing fiberglass insulation. We then air-seal the subfloor which separates the living space above from the crawlspace by sealing all penetrations with foam spray. New polyethylene vapor barrier is installed on the crawlspace ground: 10-mil (option for 12 and 20 mil) heavy duty vapor barrier set it in place with heavy-gauge galvanized liner staples, 6"+ roll-up on all piers, 12"+roll-up on the perimeter wall, and tape all piers.

We then seal with BoraFoam® Rigid Foam Board. BoraFoam® is 2.5" thick and set into the crawlspace exterior wall with concrete anchors, the seams taped with vapor barrier tape, and the edges sealed with foam spray. We further install the BoraFoam® onto the rim joists, sealed with foam spray.  The still plate and 3" below the still plate remains exposed for future termite inspections.

The BoraFoam® is pretreated with Borate, an anti-termite additive.  It also comes pre-laminated with 3-mil polyethylene vapor barrier attached on each side (6-mil accumulative).

Once sealed, a means to condition the air is required. We install MegaDry® Crawlspace Dehumidifiers for this purpose, as they are of high quality and specifically designed for this purpose. The MegaDry® system is properly drained to the exterior. The crawlspace entry door is insulated and air-sealed. Lastly, we install a thermo-hygrometer with a wireless sensor hung in the crawlspace and a base unit provided so that the homowner can monitor crawlspace temperature and relative humidity, which optimally will remain below 60%.

A fully sealed crawlspace allow an environment that is clean and not conducive to high relative humidity. This precludes corrosion and the growth of mildew and mold. As the air is now clean in the crawlspace, the indoor air quality in the living space above is correspondingly improved. With the temperature in the crawlspace also moderated, the living space will feel more comfortable while the homeowner enjoys improved energy efficiency. On average, a sealed crawlspace will save a homeowner about 10% on their heating and cooling costs.