Topic C3Superstructures - roofs

Flat roof pros and consFlat Roofing – Advantages• Good for smaller structures, such as

garages and extensions. • Flat roofing is generally cheaper to

construct as it involves less materials and labour than a pitched roof.

• Fast construction - can usually be completed in a single day.

Flat Roofing – Disadvantages• Lifespan for a felt flat roof is only 20

years.• Having to maintain and eventually

replace this type of roof can be off-putting.

• Aesthetics Flat roofs generally don’t look as visually pleasing as a pitched roof.

Pitched roof pros and cons

• Pitched Roofing – Advantages• Loft Space - can provide usable space in the loft area. • Lifespan - much longer than a flat roof, because materials are more

durable and weather resistant. • Warmer than a flat roof - rooms under a flat roof can be cold as

they are not as well insulated.• Aesthetics Pitched roof buildings blended in with surroundings

better than a flat roof.•

Pitched Roofing – Disadvantages•

Expense - more complex design, additional building materials and extra labour costs significantly more than a flat roof.

• Foundations Pitched roofs are heavier than flat roofs so they place a greater burden on the foundations of the building.

Sketch a diagram of a cross section through a timber flat roof construction form. You should annotate your diagram.

Sketch a diagram of a cross section through a timber flat roof construction form. You should annotate your diagram.

Rain water goods

• 1. Gutter: up to 3m lengths, must slope gently downwards.

• 2. Gutter Union Bracket: Connects two gutter pieces

• 3. 90° Gutter Angle: Allows guttering to go around a corner.

• 4. Stop End Outlet: Sits at the end of a run of guttering and lets water out to the downpipe.

• 5. Hopper: Funnel-shaped rainwater collector that diverts to a downpipe.

• 6. Downpipe: Available in lengths up to 2.5m, it lets water run down to the shoe.

• 7. Downpipe Bracket: fixes a downpipe to the wall..

• 8. Shoe: Fitted at the base of the downpipe to discharge water away from the wall, into a drain.

Fascia, soffit and bargeboards

• Fascias and bargeboards are usually made of timber but can be plastic or even made from aluminium.

• Guttering is typically made of plastic but can also be aluminium or cast iron

• The horizontal "fascia board" which caps the end of rafters outside a building may be used to hold the rain gutter. The finished surface below the fascia and rafters is called the soffit or eaves.