Hi there,
I was just about to put the finishing touches to some loft insulation I'm putting in when it occurred to me that I don't want to go screwing things up.
Roof is an original Victorian terrace house, with a room built in (was built like this, not a conversion). Main bit of room is covered in plasterboard, and I know there is a small amount of normal loft insulation material there, im not removing the entire inner roof to fiddle with this
A small area out the back which acts as a storage space has zero insulation in it, and im sorting this out.
Typical rafters, with felt and slate above.
Now some years ago, on some bad advice, I tried putting polystyrene between the rafter joists, not knowing about ventilation requirements. Bottom of the rafters got filled with some expanding foam as the amount of air blowing in was vast as were the amount of birth feathers getting in.
All the polystyrene came out a week later when I noticed water dripping out from between joins in the foam.
Since then the roofing felt has had some bits of draft excluding foam (like you stick around the edge of a door) stuffed in some of the gaps where pieces overlap. Temperature in adjacent room went up 4 degrees after doing this There is still some airflow through these joins though.
Rafters are around 50mm deep - so there's my airflow gap I should have had
So I am putting up metallic covered bubble wrap stuff, with metal foil to fill in the gaps. (Equiv. of 50mm of polystyrene)
So I was wondering if I will be safe just covering the whole of the inside of the roof bit of this area as is, or if I need to think any more about ventilation, or make holes in the foam that's at the bottom of the rafters to the outside world, or something else.
Have enclosed some pics of what it looks like. Room next to this area = proper living space room - though rather cold right now
Cheers!
M.
Can see big roof beam going across here. I was also going to cover the gap between the board and this beam with some insulation too.
Done so far + door into living area next to this space
White patches aren't mould - just some white colouring on joists.
Close up of foam filled bottom bits - I was going to bring the insulation down and over the white boarding for a bit extra + use up any spare overlap.
I was just about to put the finishing touches to some loft insulation I'm putting in when it occurred to me that I don't want to go screwing things up.
Roof is an original Victorian terrace house, with a room built in (was built like this, not a conversion). Main bit of room is covered in plasterboard, and I know there is a small amount of normal loft insulation material there, im not removing the entire inner roof to fiddle with this
A small area out the back which acts as a storage space has zero insulation in it, and im sorting this out.
Typical rafters, with felt and slate above.
Now some years ago, on some bad advice, I tried putting polystyrene between the rafter joists, not knowing about ventilation requirements. Bottom of the rafters got filled with some expanding foam as the amount of air blowing in was vast as were the amount of birth feathers getting in.
All the polystyrene came out a week later when I noticed water dripping out from between joins in the foam.
Since then the roofing felt has had some bits of draft excluding foam (like you stick around the edge of a door) stuffed in some of the gaps where pieces overlap. Temperature in adjacent room went up 4 degrees after doing this
There is still some airflow through these joins though.Rafters are around 50mm deep - so there's my airflow gap I should have had
So I am putting up metallic covered bubble wrap stuff, with metal foil to fill in the gaps. (Equiv. of 50mm of polystyrene)
So I was wondering if I will be safe just covering the whole of the inside of the roof bit of this area as is, or if I need to think any more about ventilation, or make holes in the foam that's at the bottom of the rafters to the outside world, or something else.
Have enclosed some pics of what it looks like. Room next to this area = proper living space room - though rather cold right now
Cheers!
M.
Can see big roof beam going across here. I was also going to cover the gap between the board and this beam with some insulation too.
Done so far + door into living area next to this space
White patches aren't mould - just some white colouring on joists.
Close up of foam filled bottom bits - I was going to bring the insulation down and over the white boarding for a bit extra + use up any spare overlap.
