Hi,
I have a small glazed sunroom with a plastic roof that can only be used a few weeks in spring and fall but not in summer because it gets too hot... When it's 17 degrees outside and partly cloudy, it easily becomes 34 degrees in the room.
My plan now is to switch to a metal roof with some insulation and a ceiling to hopefully lower the temperature when it gets extremely hot.
I'm thinking of something like this:
Metal
28x70 support battens
25x45 counter battens
145x45 rafters
145mm insulation in the rafter spaces
28x70
Lacquered beadboard
Does this work? I got a tip to place condensation fabric between the counter battens and rafters, but from what I understand, it's completely sealed. Won't I get condensation on the inside of it then?
Grateful for quick responses and ideas as there's a carpenter coming on Tuesday to help me. I don't want to end up with wet insulation and moisture damage
The room will not be heated except possibly for a few days a year.
The glass section is single-pane. The floor is decking with floor foam and laminate flooring on it (I'm thinking of slipping some foam sheets under the floor to make it a bit more comfortable to walk on when it's cold outside; the room is raised, so there's about 50cm of air under the decking).
Three of the four walls are insulated in the room as it's built between my house and the neighbor's house, with a heated garage at the back.
I have a small glazed sunroom with a plastic roof that can only be used a few weeks in spring and fall but not in summer because it gets too hot... When it's 17 degrees outside and partly cloudy, it easily becomes 34 degrees in the room.
My plan now is to switch to a metal roof with some insulation and a ceiling to hopefully lower the temperature when it gets extremely hot.
I'm thinking of something like this:
Metal
28x70 support battens
25x45 counter battens
145x45 rafters
145mm insulation in the rafter spaces
28x70
Lacquered beadboard
Does this work? I got a tip to place condensation fabric between the counter battens and rafters, but from what I understand, it's completely sealed. Won't I get condensation on the inside of it then?
Grateful for quick responses and ideas as there's a carpenter coming on Tuesday to help me. I don't want to end up with wet insulation and moisture damage
The room will not be heated except possibly for a few days a year.
The glass section is single-pane. The floor is decking with floor foam and laminate flooring on it (I'm thinking of slipping some foam sheets under the floor to make it a bit more comfortable to walk on when it's cold outside; the room is raised, so there's about 50cm of air under the decking).
Three of the four walls are insulated in the room as it's built between my house and the neighbor's house, with a heated garage at the back.
I find it unsettling to insulate under sheet metal roofing...
Paper is the classic, but some people now use roofing felt as you were advised, according to this thread you can lay felt without sheathing.
But you must have a condensation barrier between the metal roof and insulation, otherwise you'll just have to replace damp and moldy insulation in a few years.
Also, think about how the roof should be ventilated if you insulate, as it may affect how you construct your ridge, but hopefully the carpenter has knowledge of that.
Paper is the classic, but some people now use roofing felt as you were advised, according to this thread you can lay felt without sheathing.
But you must have a condensation barrier between the metal roof and insulation, otherwise you'll just have to replace damp and moldy insulation in a few years.
Also, think about how the roof should be ventilated if you insulate, as it may affect how you construct your ridge, but hopefully the carpenter has knowledge of that.