ᐅ Retrofitting insulation from above on a bungalow with a hipped roof
Created on: 6 Nov 2022 08:39
F
fanavityHello,
My wife and I bought a bungalow from 1977 in 2015. In 1999, due to leaks, a hip roof was installed over the old damaged flat roof. However, the old chipboard and roofing membrane were not removed beforehand.
When we bought the house, we opened up the ceiling and insulated it with 20cm (8 inches) of glass wool plus a vapor barrier.
Now I am wondering whether it is possible or advisable to add insulation on top of the old flat roof. Since saving as much energy as possible is important right now.
The facade is very difficult to properly insulate, but all the windows and the front door have already been replaced.
My idea was to either glue polystyrene foam (10-12cm / 4-5 inches) on top of the old flat roof or to install battens and then insulate with 10-12cm (4-5 inches) of glass wool, followed by 18-22mm (0.7-0.9 inches) OSB boards on top.
Would this make sense, or would it be better to forget the whole plan?
My wife and I bought a bungalow from 1977 in 2015. In 1999, due to leaks, a hip roof was installed over the old damaged flat roof. However, the old chipboard and roofing membrane were not removed beforehand.
When we bought the house, we opened up the ceiling and insulated it with 20cm (8 inches) of glass wool plus a vapor barrier.
Now I am wondering whether it is possible or advisable to add insulation on top of the old flat roof. Since saving as much energy as possible is important right now.
The facade is very difficult to properly insulate, but all the windows and the front door have already been replaced.
My idea was to either glue polystyrene foam (10-12cm / 4-5 inches) on top of the old flat roof or to install battens and then insulate with 10-12cm (4-5 inches) of glass wool, followed by 18-22mm (0.7-0.9 inches) OSB boards on top.
Would this make sense, or would it be better to forget the whole plan?
You have already insulated the ceiling/old flat roof from below with 20cm (8 inches) of glass wool and now want to add more insulation from above, even though the roof screed area is unused? If so, an insulation layer between the rafters might be a better option, depending on the connection to the façade. How do you access the roof—do you have a loft ladder, and is there room for improvement there? Do you know someone with a thermal imaging camera, or can you rent one? Since outdoor temperatures are near freezing now, it would be a good time to inspect and specifically look for thermal bridges.
Exactly,
The roof was insulated from below. The attic is used only as a storage space and is intended to remain uninsulated. The roof surfaces are significantly larger than just the floor area. The hip roof was simply screwed onto the old flat roof. There is no special connection to the building. Insulating the intermediate ceiling from above was just an idea to increase the insulation effect. If it does not make sense, I can leave it as it is.
There is a pull-down ladder to access the attic.
This ladder is also insulated.
Using a thermal imaging camera, we detected no significant thermal bridges in the ceiling area.
The roof was insulated from below. The attic is used only as a storage space and is intended to remain uninsulated. The roof surfaces are significantly larger than just the floor area. The hip roof was simply screwed onto the old flat roof. There is no special connection to the building. Insulating the intermediate ceiling from above was just an idea to increase the insulation effect. If it does not make sense, I can leave it as it is.
There is a pull-down ladder to access the attic.
This ladder is also insulated.
Using a thermal imaging camera, we detected no significant thermal bridges in the ceiling area.
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