Condensation in attic

plumb1_2

Do you have a central heating tank in the loft????

[Deleted User]

malc_b wrote: »

Extra insulation over results in a colder roof and condensation. The way the installers fix this is to add more ventilation in the roof by wedging open the felt with polystyrene wedges (search google for polystyrene roof wedges to see a picture). I would suggest carving up a sheet of polystyrene insulation to make some.

Sure I've seen some weird polystyrne wedges up there....

[Deleted User]

Chunks wrote: »

Interesting thread this. My loft space is well insulated and the vents around the eves are unblocked. I too get condensation at this time of year. I know it will be bone dry in a few months, so don't stress about it.

I guess (but don't know) that if the air is damp and therefore humid outside the house, open areas to the elements (roof space is to some extent) will be similarly subject to high humidity. Suppose the key is to facilitate the movement of air.

I have seen new builds with tile vents (if that's what they're called). May be Malc_b is on to something.

Trouble is the stuff I've got stored up there gets dripped on and is getting damp.

[Deleted User]

plumb1 wrote: »

Do you have a central heating tank in the loft????

no central heating tank.

[Deleted User]

john-306 wrote: »

I have this problem every winter too, when extra insulation was put in loft they put polystyrene wedges between the felt and the soffit vents are clear, but we still get condensation and it drips at times, I just solve it by running a humidifier up there now and that clears it.

De-humidifer you mean? Is it effective?

Have had a look and theres no vent pipe leaking. Pretty sure its something the builder has done fitting the new fascias. Maybe hes supposed to leave a gap and didnt?

Trying to get him to come back but hes so thick he probably wont't have a clue.

john-306

[quote=[Deleted User];64432302]De-humidifer you mean? Is it effective?

Have had a look and theres no vent pipe leaking. Pretty sure its something the builder has done fitting the new fascias. Maybe hes supposed to leave a gap and didnt?

Trying to get him to come back but hes so thick he probably wont't have a clue.[/QUOTE]

Oops yes, De-humidifier

There is nothing whatsoever, tanks, pipes vents etc in my loft, I've got soffit vents too which seem clear so no idea what is causing my problem.

I run it up the loft a few days ago and it cleared all drips and sweat on the roof felt, I do this not because the odd few drips would cause any damage where the land, but because I don't want the wooden roof trusses that are directly under the felt to get wet and rot.

Furts

Hi paulfoel

Assuming you have cavity walls, the roof insulation should continue over the wallplate built onto the top of your wall. It should thoroughly overlap, or join, with any cavity wall insulation that you have.

Has your builder pushed back this insulation to make it easier to do his new fascias? If so, has it been carefully replaced? If not, there will be a cold bridge introduced around the edges of your roof that will cause condensation.

HTH