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A dwelling house has a traditional cut roof with a pitch of 45 degrees, as shown in the sketch - Leaving Cert Construction Studies - Question 5 - 2009
Question 5
A dwelling house has a traditional cut roof with a pitch of 45 degrees, as shown in the sketch. The roof, which is insulated, is covered with concrete roof tiles whi... show full transcript
Worked Solution & Example Answer:A dwelling house has a traditional cut roof with a pitch of 45 degrees, as shown in the sketch - Leaving Cert Construction Studies - Question 5 - 2009
Step 1
Draw a Vertical Section at the Ridge
Answer
Using a scale of 1:5, begin by drawing the apex of the roof at the ridge. Use the given pitch of 45 degrees to create the roof slope on either side of the ridge. Ensure the angles are accurately represented for a traditional cut roof.
Next, measure down 150 mm from the ridge to represent the collar tie's placement and draw it horizontally across the section.
Include three courses of tiles at the ridge, ensuring that each tile is properly aligned and illustrated, with the correct lap of tiles depicted.
Step 2
Label the Roof Components and Sizes
Answer
Label the following components in your section:
- Ridge Tile
- Ridge Vent
- Ridge Board: 300 mm x 32 mm
- Tiles
- Tile Lap
- Batten: 50 mm x 25 mm or 44 mm x 30 mm
- Micro Porous Vapour Barrier
- Rafters: 200 mm x 50 mm
- Collar Tie: 125 mm x 50 mm
- Insulation between and over collar ties
- Insulation between rafters with air space
Present these labels clearly on your drawing to ensure conceptual clarity.