May 10, 2009 · 17,248 Posts. #6 · Feb 21, 2009. 2x3 is fine, bottom plate should be rot resistant - PT or similar. You do not want 2 vapor barriers, it will trap moisture between the wall & the concrete = MOLD. Most houses (even my 60 year old house) has tar on the outside basement wall. This acts as a vapor barrier. Alternative to PT sill plates The Building Code ForumAug 16, 2018 · What could be placed between the concrete and the untreated plate to make it acceptable? R317.1 does not permit an impervious moisture barrier between the sill plate and foundation wall in lieu of preservative treated or naturally durable wood. The exception is for sills and sleepers on slabs.
In order to achieve a complete envelope for vapor and thermal protection, it is recommended to install all exterior wall studs at least 1 away from the wall. This will allow the CCSPF to achieve a complete vapor barrier between the porous concrete wall and your interior building material. How To Attach Bottom Plate To A Concrete Floor Home One option is to use pressure-treated 2×4 lumber made for damp areas as a bottom plate, in conjunction with properly coated fasteners, such as hot-dipped galvanized or stainless steel, in contact with treated lumber.. This will protect the bottom plate from moisture damage that can compromise the integrity of the wall. Another option is to use a barrier, such as a sill gasket (link to ). Pressure-Treated Sill Plates and the Building Code Mar 09, 2009 · The reason is simple:sill sealer. The light blue sill sealer installed between the bottom plate and concrete (most likely for air sealing) in the top photo is closed-cell foam. Its meant to be an air-sealing gasket, but it also is working as a capillary break because it keeps water in the concrete from wicking up into the wood.
The problem is that moisture tends to condense on the cool concrete walls. The water vapor can come through the concrete from the soil or from indoor air that comes in contact with the concrete. With fiber insulation and a vapor barrier, moisture can get trapped in the insulation leading to moldy insulation and decay in the wood framing. Use a Separate Pressure Treated Bottom Board on a Aug 15, 2008 · The metal U-channel acts a barrier between the concrete and wood frame. The downside is that when you install the base molding you have less real estate to plant your nails since the bottom plate is now only 1.5 thick as opposed to almost 3 when using 2 bottom plates, however you are eliminating the extra cost of that PT bottom layer on all your walls. What Is a Sill Plate? Hunker
- ComponentsConstructionTerminologyAmong the many components a house's structural framing, the sill plate may be the single most important element. On most homes, the sill plate is the first piece of wood in the entire house, and it essentially anchors the house to the foundation. You can see the sill plate from the inside of your house if you look along the top of the masonry walls in the basement or crawlspace. On the outside, the sill plates are covered by the wall sheathing and siding.How to Install Sill Plates:12 Steps (with Pictures) - wikiHow
Dec 14, 2012 · This is necessary for concrete, but its a best practice on a wood-floor system. The reason you want treated lumber for a bottom plate is that no matter what floor you have, its possible for foam between sill plate & concrete? - Fine HomebuildingJan 17, 2008 · Called sill sealer around here. Purpose is to seal the interface between the PT sill and concrete against air/moisture infiltration.FoamSealR 3-1/2 in. x 50 ft. Multi-Use Ridged Sill Plate
- OverviewReviewsProduct Overview. A simple, effective, long-lasting solution to air infiltration, FoamSealR sill plate gasket provides a seal against air leakage, moisture and insect intrusion at the juncture of the foundation wall and sill plate in new and retrofit construction. FoamSealR sill plate gasket is made of polyethylene foam, offering exceptional durability.repair - Can I use liquid nails to attach toe plate/sill Jun 28, 2016 · Concrete is porous and will wick moisture to anything placed on top of it. In order to prevent moisture wicking into the sill plate and consequent danger of mould, mildew, and rot, it's better to lay a 12" wide sheet of 6 mil polyethylene vapour barrier between the concrete and wood sill plate, then fasten sill plate to concrete with tapcon screws.