Dormers need particular attention because they are exposed to the weather and have many junctions between materials that need checking regularly.

How dormer windows are built

Dormers may have flat or pitched roofs. If pitched, they are usually covered in slate as they are generally too small to suit larger concrete tiles.

The sides of the dormer (cheeks) may be covered in metal such as lead, copper or zinc. Slated cheeks need to be double or side nailed.

Ridges are built like those on pitch roofs. However, gutters (if provided) drain into a side flashing on the roof.

Dormers may have hips (‘piends’) where two sloping areas of slate meet. A ‘crown piece’ covers the join between several ridges.

Problems
Dormer windows may have been added later, removing rafters in the roof and weakening the structure. This can cause the roof surface and ridge to sag.

Dormer in need of repair. Slipped vertical slates, facings in need of repainting or replacement, lead soakers missing.

Window frames usually have timber facings covering the vertical joints. Paintwork is likely to require more frequent attention, as high level paintwork suffers particularly from exposure to the weather.

Ridges, hips, slate, gutters, flashings and windows may all need attention.

Insulating dormers

Dormer windows are very exposed and a lot of heat can be lost through them. Insulation needs to be added over the existing wall finishes.

Further information

Professional help recommended?

Although the work may appear straightforward, ensure your builder or tradespeople have the skills for the job. If in any doubt, get professional help to specify and organise the repair.

Who pays?

The issue about who pays for dormer repairs is not always straightforward.

1024 724 Under One Roof

Ask for help from our team of tenement experts

Managing and maintaining a tenement building can be difficult. Under One Roof offers a free enquiry service that allows you to ask specific questions relating to your building.

Ask an expert
Newsletter
Privacy policy
Terms of service

Mid ceiling

Below ground level

Your tenement may have a basement, sometimes used for living accommodation or sometimes used for storage, cellars or wash-houses. These buildings will often also have a 'dunny' between the basement…

905 800 Under One Roof

Energy efficiency improvements

Adding insulation and draught-proofing can save money and the planet but in…

2560 1707 Under One Roof

Insulating traditional solid walls

Recent research suggests that traditional solid stone or brick walls provide better…

2560 1707 Under One Roof

Flat roofs

Flat roofs can be found on buildings of all ages. They can…

406 305 Under One Roof

Asphalt flat roofs

On stone tenements, asphalt roofs are found on: 'high backs' - raised backcourt…

406 305 Under One Roof
Start typing
Privacy Preferences

When you visit our website, it may store information through your browser from specific services, usually in the form of cookies. Here you can change your Privacy preferences. It is worth noting that blocking some types of cookies may impact your experience on our website and the services we are able to offer.

Our website uses cookies, mainly from 3rd party services. Define your Privacy Preferences and/or agree to our use of cookies.