Issues since additional loft insulation

go_cat

We had the extra thickness loft insulation put in about 18months ago. Since then the house has had a lot more condensation and wet patches appear in the ceiling below the loft space if that makes sense .

Would we be better removing the extra insulation and sticking with the original thickness

Thanks in advance

imho

Ventilation in the soffits

go_cat

imho wrote: »

Ventilation in the soffits

Thank you
If these are vents in the roof felt then we have already done that. :(

ROY47

go_cat wrote: »

We had the extra thickness loft insulation put in about 18months ago. Since then the house has had a lot more condensation and wet patches appear in the ceiling below the loft space if that makes sense .

Would we be better removing the extra insulation and sticking with the original thickness

Thanks in advance

YES it would be better

C_Mababejive

Have you ensured that the soffit vents are clear and not covered or obstructed by the insulation? What about the loft lid..is it a snug fit? You may need further vents at or close to the roof pitch

go_cat

Yes checked the eaves , added extra vents in felt, insulation pulled over hatch on inside ...we cannot understand why it is still so bad .

Currently have 2 x dehumidifiers going one up one down.

So tempted to roll it all up and get it out loft

brightontraveller

Catch 22 insulation makes the house warmer, this warm air holds more moisture either remove insulation or add more ventilation ,maybe ridge vents or tile vents high in the roof pitch

getmore4less

Don't think better roof/loft ventilation will help the issues inside the house

What do you think is generating the moisture in the house.

Showers, cooking, lack of ventilation, drying clothes...?

Is the ceiling damp from inside the room or excess in the loft?

Furts

brightontraveller wrote: »

Catch 22 insulation makes the house warmer, this warm air holds more moisture either remove insulation or add more ventilation ,maybe ridge vents or tile vents high in the roof pitch

I would agree but also add a bit of logical, or perhaps lateral, thinking. When the fibreglass layer was quite thin, the top surface would tend to be warmer. Now it is thicker, the top will be cooler. Hence condensation could occur within the fibreglass.

New houses would, typically, have a polythene membrane to stop the moisture passing through the plasterboard. Foil backed plasterboard may also be used. Furthermore, whilst it may not always be done, even cable holes and light fittings are meant to sealed to prevent moisture going through the plasterboard.

All this is aimed at keeping the fibreglass warm, and there has been a move to get warmer roof spaces without the flow of air over the top of the fibreglass. This flow chills the fibreglass and increase heat losses.

ispookie666

http://www.amazon.co.uk/gp/aw/d/B0074K582E/ref=redir_mdp_mobile/278-5457290-5207318
not sure if this might help.

SuzieSue

ispookie666 wrote: »

http://www.amazon.co.uk/gp/aw/d/B0074K582E/ref=redir_mdp_mobile/278-5457290-5207318
not sure if this might help.

There is a recent thread about this:

https://forums.moneysavingexpert.com/discussion/comment/55834203#Comment_55834203