Dormer Roof

1. Roof Covering Damage

• Cracks or splits in flat dormer roofs (felt, EPDM, GRP)
• Broken tiles on pitched dormers

2. Flashing Failure (Major Issue)

• Flashing around dormer edges can fail
• One of the most common causes of leaks

3. Joint & Seam Leaks

• Where the dormer meets the main roof
• Poor sealing or ageing materials cause water ingress

4. Window Seal Failure

• Water can leak around dormer windows
• Leads to damp, mould, or rot

5. Timber Rot

• Prolonged moisture can rot the dormer frame and supports

6. Cladding Damage

• Exterior cladding can crack, warp, or deteriorate

7. Insulation & Condensation Issues

• Poor insulation leads to heat loss and condensation

minor Repairs

• Seal small cracks or gaps
• Repair flashing
• Fix window seals
• Replace a few tiles or patch membrane

moderate Repairs

• Replace sections of flat roof covering
• Repair cladding
• Improve insulation and ventilation
• Fix junctions between dormer and main roof

major Repairs

• Rebuild dormer roof
• Replace rotten timber frame
• Fully reseal all joints and flashing

When Replacement Is Needed

• Persistent leaks
• Structural damage or rot
• Old or poorly built dormer
• Loft conversion project

Installation Steps

1. 1

   Remove Old Dormer (if replacing)

   • Strip roof covering and cladding
   • Remove damaged structure
2. 2

   Build Frame

   • Construct timber frame for dormer
   • Ensure proper support and alignment
3. 3

   Form Roof Shape

   • Flat, gable, or shed-style roof
   • Ensure correct slope for drainage
4. 4

   Add Layers

   • Membrane (waterproof layer)
   • Insulation
   • Battens (if tiled)
5. 5

   Install Roof Covering

   • Flat roof systems (felt, EPDM, GRP)
   • Or tiles/slate for pitched dormers
6. 6

   Install Window

   • Fit dormer window
   • Seal properly to prevent leaks
7. 7

   Finish Exterior

   • Add cladding (tiles, timber, or uPVC)
   • Install flashing around all edges
   • Connect gutters if needed