Roof Vs Ceiling Insulation

Ceiling insulation sits on top of your ceiling plasterboard whereas roof insulation also known as roofing blanket sits directly against the underside of your metal roof.

Roof vs ceiling insulation.

Box out light fixtures. Unvented hot roof design cathedral ceilings are also an option. 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. For example cathedral ceilings built with 2x12 rafters have space for standard 10 inch batts r 30 and ventilation.

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. It s more effective and easier to install insulation on the attic floor than in the roof assembly. The hot roof design allows more insulation to be installed in the roof cavity as the need for a vent space is eliminated. Check behind knee walls which are walls between living spaces and the garage or attic.

See the department of energy s doe ranges for recommended levels of insulation below. Turn off the electricity then remove an electrical outlet cover for a view of exterior insulation. Image courtesy of d7 spray foam insulation houston tx. Wall insulation is not suited for use in a ceiling cavity space and wall insulation r values would not be adequate for your ceiling area.

Water is insulation s enemy. Exterior walls and floors. Check garage walls and ceilings that are adjacent to conditioned spaces. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.

Roof is the top most part of the structure of a part while ceiling is what you look at when inside a room roof protects the inside of the building from heat cold and rains while a ceiling is mostly for aesthetic purposes. Additionally insulation serves as a way to enhance sound proofing on the uppermost envelop of your house. The highest r value that wall insulation reaches is an r2 7hd however we recommend a minimum of r4 0 for ceiling insulation. Looking upward through the open ceiling if the exterior wall and roof deck assemblies both contain spray foam then a continuous insulation and airtight layer is established from the base of the walls to the peak of the roof.

Unless in air conditioned attics insulation is typically installed on the ceiling plane not on the sloped roof assembly. A very energy efficient enclosure results.