Pitching The Roof: 2023 Extension Build Ep.3

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The roof pitching stage of building an extension in the UK

Design and Planning:
Before the actual construction begins, the design of the pitched roof is finalized. This would usually have been determined during the architectural design and planning stage. Factors like roof pitch angle, type of roofing material, and location of valleys, hips, and ridges are decided.

Preparation of the Site:
Ensure the walls or structures supporting the roof are completed and secured.
Set up scaffolding or other safe access systems to work at height.

Setting Out and Marking:
The location of the main structural timbers, like rafters and ridge boards, is marked out.

Installation of Wall Plates:
Timber wall plates are fixed onto the top of the walls. These act as the base on which rafters will sit and provide a level surface and anchoring points.

Ridge Board Placement:
The main horizontal timber, the ridge board, is positioned and secured. This runs along the peak of the pitched roof.

Installing Rafters:
Rafters are the sloping timbers that give the roof its pitched shape. They are fixed to the wall plates at the bottom and join the ridge board at the top.
Depending on the design, there might be common rafters, hip rafters, jack rafters, and valley rafters.

Bracing and Strengthening:
Once the primary rafter structure is in place, additional timbers or braces are added for strength and stability. Purlins might be placed to support the rafters, especially if the span is significant.

Roof Decking:
Once the timber frame is in place and secure, a layer of decking, often made of plywood or OSB (oriented strand board), is fixed to the rafters. This provides a solid base on which roofing materials, like shingles or tiles, will be laid.

Weatherproofing:
Depending on the region and expected weather conditions, a layer of waterproofing or underlayment might be added on top of the decking and beneath the final roofing material.

Roof Covering:
The chosen roofing material (tiles, slates, metal sheets, etc.) is then laid over the prepared surface, starting from the eaves (bottom edge) and working upwards.

Finishing Details:
Features like fascias, soffits, and guttering are added. Additionally, if there are any dormer windows, skylights, or vents, these would be installed or finalized at this stage.

Inspection and Quality Check:
Ensure that the roof is securely fixed, and there are no gaps or weaknesses. The quality and integrity of the roofing material and installation are verified to prevent leaks or future issues.

About Dylan Garton

Dylan Garton is a co-founder, video producer and editor for the Skill Builder social media platforms.

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