Proper Insulating Roof Ceiling

Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be.

Proper insulating roof ceiling.

Sprayed against the underside of the roof deck it seals against air movement eliminating the need for a vapor barrier or ventilation. But its open cell structure still allows moisture to escape. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. If you don t have an attic however there is.

The hot roof design allows more insulation to be installed in the roof cavity as the need for a vent space is eliminated. Insulation level are specified by r value. Foil faced batt insulation is recommended in cathedral ceilings because it offers the permeability rating required for use in ceilings without attics. Illustration by ian worpole.

The higher the r value the better the thermal performance of the insulation. When tom insulates a cathedral ceiling or a finished attic he also turns to foam. For example cathedral ceilings built with 2x12 rafters have space for standard 10 inch batts r 30 and ventilation. Unvented hot roof design cathedral ceilings are also an option.

It provides an open airy look and feel to the room and they are often in demand among home buyers. Box out light fixtures. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.

It s easier to knock out in a weekend and it s more relevant to most people s goals when it comes to insulation. Water is insulation s enemy. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

When the ceiling is a cathedral type then you must provide a space between the roof decks and the ceiling in order to have room for insulation and ventilation. A cathedral ceiling is a sloping and pointed ceiling which is usually high and open. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. How to put insulation in a ceiling before drywall.

If you have an attic there are quick ways to insulate the ceiling from above after drywalling it. Cathedral ceilings are a feature in many homes that add to value to the house because the high ceiling tends to make rooms look larger.