Loft Insulation Question

[rob_b]

My partner had one of these companies that come round to make your house more efficient install some loft insulation beginning of the year upon noticing damp patches on some of the rooms ceilings i went to look in the loft to find the new insulation had been laid length ways across the joists and old insulation and also there is a gap of around 12" all the way round the edge which seems about the same size as the damp patches. Could the lack of insulation the cause of the damp problem and is it normal to run the insulation like they have?
Any help is gratefully received.

 

[Deluks]

They appear to have laid it correctly going by your description. The space round the edges it to let airflow in/out at the eaves for essential roof ventilation. Potential causes for the problem could be:

A) leaky roof. Check for slipped tiles, it's windy this time of year.

2) damaged pipes. The installers may have damaged pipework while they were up there. Get some gloves on and have a look under the insulation, where the patches are.

III) condensation. If she has no open air vents and keeps all the windows closed in the winter the water vapour will have nowhere to go, and will form on walls/ceilings. Especially if she dries her clothes on radiators etc.

If the patches correspond with the uninsulated areas then the warm moist air could be meeting the fresh cool air coming in through the soffit vents and condensing on ceiling. Meaning condensation is to blame.

 

[rob_b]

Patches are in the bedrooms only towards the outer walls to about where the insulation starts. Above the landing window there is no gap in the insulation and no damp patch.
She doesn't have central heating or any pipes in the loft so that rules them out also had a look to see if any tiles are loose and any damp patches in loft cant see any.