Gambrel Roof

1. Tile or Slate Damage

• Cracked, slipped, or missing tiles
• Lower steep slope is more exposed to wind and rain
• Can quickly lead to leaks

2. Slope Transition Weak Point

• The joint where the upper and lower slopes meet is critical
• Poor sealing or ageing can allow water in

3. Ridge Problems

• Ridge tiles at the top can loosen
• Mortar can crack over time

4. Gable End Issues

• Vertical end walls can crack or suffer weather damage
• Wind pressure is higher here

5. Roof Leaks

• Common at slope transitions, flashing, and ridge

6. Timber Stress or Movement

• The design puts different loads on the frame
• Can lead to sagging or shifting

7. Flashing Failure

• Around chimneys or joints
• Water ingress if flashing deteriorates

8. Water Runoff Issues

• If drainage isn't well designed, water may collect at slope transitions

minor Repairs

• Replace damaged tiles or slates
• Repoint ridge tiles
• Seal joints at slope transition
• Fix flashing

moderate Repairs

• Replace sections of underfelt or battens
• Repair slope transition detailing
• Fix small structural timber issues

major Repairs

• Large-scale retiling
• Structural reinforcement of rafters
• Fix sagging areas or movement

When Replacement Is Needed

• Roof is ageing (15–20+ years depending on material)
• Repeated leaks
• Structural movement or sagging
• Renovation or conversion project

Installation Steps

1. 1

   Remove Old Roof

   • Strip tiles, battens, and underfelt
2. 2

   Inspect Structure

   • Check rafters and supports
   • Replace damaged timber
3. 3

   Build the Frame

   • Construct dual-slope rafters
   • Ensure strong support at slope transition
   • Install ridge board
4. 4

   Add Layers

   • Breathable membrane
   • Battens
   • Insulation (if needed)
5. 5

   Install Roof Covering

   • Tiles or slate applied across both slopes
   • Extra care at slope junction
6. 6

   Finish Details

   • Ridge tiles fitted
   • Flashing installed
   • Gutters and drainage connected