I posted this query on the HVAC reddit but as thats largely a US site I thought I might have better luck here....
My dad has a 1960s semi.
For years he had an old 'behind-the-gas-fire-in the living-room' type boiler, venting up the chimney. With a hot water tank in the loft (attic).
This packed up about 6 years ago and they removed the fire and boiler and water tank, and replaced with a new combi boiler in the attic where the tank used to be.
All working fine, but we noticed that the attic was getting a little damp. They've always used it for storage and now started to notice cardboard boxes were getting a bit soft, almost soggy.
We ignored it (I know !) and its just got worse and worse. Now its obviously very damp up there. Anything not sealed in airtight storage tubs is getting ruined. There's visible mould on the bit of carpet he laid up there and on suitcases etc.
Good loft insulation on the floor of the loft. Nothing on the ceiling of the loft (underside of the roof).
There are vent holes cut into the overhang under the gutter - they've been there years, but are still all clear and still 'venting'. He definitely had no damp issue up there before the boiler was moved.
Any idea what's going on ? Advice ?
We assume the boiler being up there is the issue, but why? Was something missed when it was installed or something ??
My dad has a 1960s semi.
For years he had an old 'behind-the-gas-fire-in the living-room' type boiler, venting up the chimney. With a hot water tank in the loft (attic).
This packed up about 6 years ago and they removed the fire and boiler and water tank, and replaced with a new combi boiler in the attic where the tank used to be.
All working fine, but we noticed that the attic was getting a little damp. They've always used it for storage and now started to notice cardboard boxes were getting a bit soft, almost soggy.
We ignored it (I know !) and its just got worse and worse. Now its obviously very damp up there. Anything not sealed in airtight storage tubs is getting ruined. There's visible mould on the bit of carpet he laid up there and on suitcases etc.
Good loft insulation on the floor of the loft. Nothing on the ceiling of the loft (underside of the roof).
There are vent holes cut into the overhang under the gutter - they've been there years, but are still all clear and still 'venting'. He definitely had no damp issue up there before the boiler was moved.
Any idea what's going on ? Advice ?
We assume the boiler being up there is the issue, but why? Was something missed when it was installed or something ??