How To Achieve Roof Insulation Over Decorative Ceilings

Additional insulation can be placed between the rafters using batts dense pack or low density spray foam to reach the desired overall r value.

How to achieve roof insulation over decorative ceilings.

Insulating fiberglass ceiling tiles are the perfect solution for jobs that require a lay in ceiling panel with access above and high r value. Insulation should be installed right to the eaves so the batt is 50mm over the outside wall. Perhaps the best performing arrangement is adding a four to six inch layer of low gwp rigid insulation to the roof deck. For ceilings with an attic space above section 402 2 1 allows the reduction in r value for your zone from r 49 to r 38 wherever the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves.

For an addition the usual approach is to use the prescriptive method. Calculate additional insulation needed. Measure the depth of your current insulation. Where it s not technically feasible to achieve a u value of 0 18 w m k a value of 0 35 w m k is the target and for a listed building or where 0 35 w m k is simply not achievable 0 70 w.

How you will tackle this will depend on whether there is an existing ceiling the type of external roof covering and how much headroom is available. R 38 is the industry standard and the minimum thickness for r 38 is 12 inches. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. If your current insulation is only 5 inches deep you ll need to add seven inches of insulation to achieve the 12 inch r 38 rating.

The sheets of insulation are held in place with furring strips that also create a ventilation channel. Insulating fiberglass ceiling tiles are the perfect solution for jobs that require a lay in ceiling panel with access above and high r value. Standard r3 5 ceiling insulation batts are 185mm thick so depending on the roof pitch the batts may touch the underside of your roof at the edges of your ceiling. They are made from a rigid 3 thick fiberglass with a thin vinyl laminated to the face providing a stellar nrc value for noise absorption in the room and a fantastic r value for insulation and noise blocking.

However you need to leave an air gap of 20mm between the insulation and your roof. Interior wood framed ceiling insulation. A second layer of roof sheathing and roofing material caps the assembly.