Exterior Wall Insulation Design

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Exterior wall insulation design.

It s installed over the exterior walls of the home and can have several purposes from lending structural support to helping to insulate the home. In most wall applications you will use r 13 or r 15 kraft faced fiberglass insulation rolls for these two by four stud walls. As these walls are your home s first line of defense it s important that the insulation you use accounts for all of the changing weather conditions outside. Condensation and elevated moisture levels cause rot mold and mildew.

These are pre cut sections of insulation that are usually fiberglass although cellulose mineral wool natural fibers and plastic versions are also available. Insulation for 2x4 walls most wall assemblies especially those in older homes are built with two by four 2x4 studs. The advantages are plenty here panels are between 4 5 inches and 8 inches thick the exterior insulation is continuous and they can be attached with 6 inch 10 screws from 4 to 6 inches long. Best for unfinished walls floors and ceilings.

If the exterior wall sheathing is below the dew point temperature condensation will form on the sheathing. Designed for easy handling and use between framing such as studs and joists making it among the best insulation for walls. Since modern two by fours are not 4 inches the true depth of the wall cavity is 3 1 2 inches. Non structural exterior wall installation of the sheathing is on the exterior or interior side of the structural sheathing.

The entire 14 inch cavity between the exterior and interior wythes is filled with dense packed cellulose insulation r 53. A continuous layer of insulating sheathing applied to the exterior surface of a wall will minimize condensation and moisture levels. Exterior sheathing is a board or panel that may be made of several different materials. The energy performance of exterior walls is enhanced by continuous insulation between the siding and the framing which may also influence the selection of a vapor retarder in the wall.

Non structural exterior wall sheathing also called insulating sheathing is installed on the exterior wall to add insulation and provide a radiant barrier. For this third wall to work almost everywhere except alaska and north of flyn flon where we would not insulate even within a relatively non conductive wood structural frame we would split the thermal resistance of the insulation on the exterior of the structural frame with this insulation within the structural frame at least 50 50. Building codes and green building standards are continuing to raise the bar on energy efficiency and high performance in buildings. For the outside facing walls of your home insulating exterior walls is a cost effective way to reduce heat loss and help prevent moisture buildup in your home year round.