Insulating An Attic

by Tobe
(New Jersey )


Insulating An Attic Tips;In a well designed attic, vapor barriers, insulation, and vents work together to prevent moisture damage and keep the home comfortable in every season.


If you have an unfinished attic that isn't insulated, adding insulation can substantially lower your utility bills and improve the comfort level inside your home. Here's how to proceed: Before starting, evaluate your existing insulation and calculate how much you need to add.

Use a piece of plywood to help support your weight on the joists; never step on the spaces between them. If you're insulating an attic from scratch, use faced fiberglass insulation (in vely warm cli-mates, check local Building Codes; the facing may not be necessary). If you're adding to existing insulation, use unfaced batts. Begin by attaching baffles to the roof sheathing or rafters to keep the insulation from blocking the air flow under the roof. The baffles should extend past the bottoms of the ceiling joists, to provide a free flow of air from the soffit to the attic. Without this gap, moisture can become trapped inside the rafter spaces and cause the roof sheathing, wallboard, or plaster to break down and rot. Next, locate and seal all thermal bypasses gaps or cracks around chimneys and plumbing pipes where heat and moisture can rise into the attic from the heated spaces below. Roll out the insulation, starting at the farthest point from the attic access, and working toward it (photo C). If you're using faced


Tools: Respirator or face mask, glove's, tape measure, utility knife, straight edge, plumb line, insulation board saw, staple gun. Materials: 6-mil poly vapor barrier, baffles, insulation, 2 x 2 furring strips, construction adhesive, plywood sheets, panel adhesive.

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