sheathing with foam board vs. osb or ply sawblade posted in construction techniques on july 18, 2005 04:38am i dont know about other areas, but in just the last few years builders have been sheathing walls with foam board with intermittent osb/ply instead of sheathing the entire exterior walls with osb or ply.
re: osb vs foam board sheathing. another factor in the final appearance of a vinyl siding job is the consistancy of the fastener application. if any of the fasteners are over driven, they can prevent the siding from moving the way that it needs to, leading to warping and waviness that can be much more noticeable than variations in the wall plane caused by studs and sheathing.
in my local area there is a green building consultant that recommends a ci panel which is basically eps foam glued to osb. the way this is installed would be the osb to the exterior. almost every house i see with exterior rigid foam in my online wonderings is covered with blue and pink xps, the osb sheathing is nailed directly to the studs and is completely covered with the rigid foam.
the sheathing is outside the insulation not inside and therefore colder. this moves the dew point into the cavity, into the rigid closed cell 'splash' insulation. no surface for the moisture to condense on so no liquid present. this is the same dew point positioning science as putting the sheathing on the outside of the rigid foam boards.
rigid foam as an insulation strategy. rigid foam sheathing is a form of insulation continuous insulation, to be exact thats applied to the exterior of the building.continuous rigid insulation is a construction solution that provides a thermally efficient building enclosure.
if you want to use the rigid foam sheathing as your wrb, you can. however, you still need to address the challenge of flashing each window opening so that the rough window opening has a sill pan under the window. this sill pan or site-built sill flashing must direct water to the wrb -- that is, the exterior of your rigid foam.
non-structural exterior wall installation of the sheathing is on the exterior or interior side of the structural sheathing. insulating sheathing comes in various r-values. examples of non-structural exterior wall sheathing are plastic, foam, cellulose fiber, paper faced and foil faced boards. visit barricade building products for more
zip system r-sheathing is the simple all-in-one structural panel with built-in exterior insulation. featuring integrated moisture, air and thermal protection, zip system r-sheathing completely reimagines traditional wall assemblies by streamlining exterior water, air and thermal management. built-in exterior insulation
insulated foam sheets are also used as an insulated sheathing underlayment for exterior siding. the panels provide a continuous energy-efficient surface. this eliminates thermal bridging, which is the energy lost through wall studs. the studs conduct more heat than the insulation between them.
in its guide to insulating sheathing, bsc describes the use of exterior rigid insulation board in the enclosure assembly to act not only as insulation but also as the primary sheathing and, in certain areas, as the drainage plane and vapor control layer for the wall assembly see exterior sheathing profiles diagram. general considerations
johns manville ci max polyiso foam sheathing board is available in r-values up to r-26 and provides a continuous layer of insulation to reduce thermal bridging and improve energy efficiency. ci max sheathing is designed for exposed interior applications and is approved for use without a thermal barrier.
foam board sheathing makes good insulation. its easy to install, easy to keep in place and its readily available and relatively cheap to buy. it comes in different thicknesses and fits outside the house with siding applied over the top. before buying foam board sheathing, its important to
exterior wall sheathing is important for strength and securing siding. but theres more to it than meets the eye. exterior sheathing is used to help strengthen the walls of a new home. when used in home construction, exterior wall sheathing is very multi-functional. to get the most from installing foam board as sheathing, most
by using a 1/2-inch foam insulated sheathing r-2 to r-3.5 in combination with wall cavity insulation, the total r-value of the exterior wall will be increased, contributing to greater energy efficiency. sheathing thicker than 1/2 inch will yield even higher r-values.
these two approaches are quite different in both how the foam is installed and also the orientation of the foam with respect to the framing and sheathing. exterior foam board this is probably the most common approach to exterior foam insulation. a layer of xps or polyiso foam board insulation is installed on top of the wall sheathing.
i have read a number of other articles related to sheathing and the use of rigid foam panels for insulation and was wondering; is it possible to place a 1' to 2' rigid foam panel against the wall studs and then use osb on top of that as the exterior of the building?
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