Cavity wall insulation removal due to damp?

[BeeInYourBonnet]

Has anyone had this done?
We had a roof leak over the winter and now have damp in two of the bedrooms. We have insulation beads in the cavity, and there is definitely a lot of moisture in the cavity.

The leak was fixed (fingers crossed) 3 months ago, and damp on walls hasnt improved much. Presumably the filled cavity is exacerbating the problem and stopping it drying out.

The CWI seems to have caused (or worsened) damp in a number of areas, and I very much regret ever getting it done. Had anyone got any experience if getting it removed: cost/mess/benefit??

Bump

I imagine the wall insulation has become damp and due to the fact it is trapped between walls, it is struggling to dry out. Can you get a few bricks taken out to see what is happening? No idea how you get it out, or who would do it. What sort of insulation is it? I would get it replaced at some stage because you may notice you have higher heating bills. The fact it is not drying out might suggest your walls are not breathing and damp is still trapped. Could this be happening?

It is actually very unusual for damp to be caused or worsened by CWI, it can happen when the house was not properly surveyed and has defective render, pointing or brickwork allowing rain penetration, especially if there is a lot of dropped mortar in the cavity and lying on the wall ties.

In your case the damp sounds to have been caused by the leak so you want to speed up the drying. Quickest and cheapest way is to open the windows and move furniture away from the walls to allow air circulation. In alcoves snd nooks it helps to put an ordinary fan to blow on the wall. No need to heat.

Builders say a wet wall takes a month to dry an inch of thickness. Plaster and wallpaper, especially vinyls, prevent the water evaporating so it takes longer.

Draw a pencil mark round damp patches, and write the date on, so that you can see if they are getting smaller, and how long it takes.

If there is no wind through the windows, in summer it helps to open the loft hatch, and warm moist air will rise upwards through the house and escape through the roof.

Thanks Milly and piglet.

I did make pencil marks and the damp has spread beyond them. It seems like the damp is dryijng in the middle of the 'patch' but spreading outwards. Almost like its trying to find dry bricks to spread into IYSWIM!

I have asked a surveyor to come and have a look. I'm worried we'll be told to replace the render (big job!), even though the leak definitely came from the roof.