How To Blow Insulation Below Roof

Use hardware cloth metal flashing or scrap plywood to create a safety gap of at least 3 inches all around fixtures.

How to blow insulation below roof.

The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies. Basically if you spray or stuff insulation into a wall cavity in an existing building pay close attention to the type and condition of the wiring that may be in the cavity. For the center areas hold the hose level and blow in insulation evenly until you ve reached your level lines photo 6. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation.

Cut a section long enough to fill the bay from a roll of insulation using a utility knife. Climb the ladder and measure the length of one of the bays between a pair of joists with a tape measure. Move across the attic until you ve hit your desired height at every point. The type that is right for your flat roof insulation job depends upon the state of the roof expert opinion on the best type and your budget.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Blow in insulation until the hopper is empty. You don t want to be halfway done and only have a little insulation left. The hole is then.

Input length width and desired r value of the area to be insulated. Unless you re using mineral wool insulation or your fixtures are rated safe for contact with any type of insulation don t allow the material to touch or cover recessed cans or lights from the floor below it s a fire hazard. Then pivot in place and do the same thing to the other side. This calculator is to be used as an estimating tool only.

With a flat roof however this becomes a major concern. To install blown in insulation in existing walls holes are drilled at the top of each stud space usually on the exterior and material is blown in via a long flexible hose. The insulation itself can burn or melt in some cases or can over insulate a wire or connection causing a fire which causes the structure itself to burn. Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense.

It is important to gauge the amount of insulation you are using.