Sagging Roof

Look from a safe position at ground level and describe the shape you can see. Is the ridge dipping in the middle, does a roof slope look wavy, or is only the gutter edge out of line? Those are not interchangeable symptoms. A gutter hanging from a damaged bracket is different from movement in the rafters behind it.

Note whether the change is new, whether it followed water ingress or work to the roof and whether doors or finishes nearby have changed too. You do not need to enter a damaged loft or walk on the roof to make the enquiry. An assessment should establish which part is moving and what supports it before a cosmetic repair is proposed.

Persistent leaks can leave supporting timber damp and vulnerable to rot. The covering may still look fairly tidy while the deck or rafter ends beneath it have softened. Replacing tiles or laying another flat-roof membrane over weakened timber does not restore the support. The cause of the water ingress and the condition beneath it both need attention.

Other causes described in our roof-replacement guide include undersized rafters, purlins that have deflected, movement at the wall plate and a previous covering change that added load. That is why choosing a different tile or slate requires a check of the structure. The proposed repair should respond to the reason for the dip, rather than just making the top surface look straighter.

A garage roof can show a hollow in the surface or a dip along its supporting timber. The flat-roof assessment needs to consider both the waterproof covering and the deck below. Ponding, damp and a soft deck can be connected, but it takes inspection to see whether the problem is limited to boards or extends into the supporting members.

Our existing flat-roof work checks the substrate and replaces rotten timber before laying a new system. If rafters or other structural members are involved, the required support needs to be established rather than guessed. Do not use the roof for storage or walk on a surface that appears unsound while waiting for assessment.

If the roof line looks straight but the gutter itself dips, the issue may be brackets, a failed section or soft fascia timber. The guttering service checks the falls, outlets and supporting boards. Correcting a blocked downpipe is not the same job as dealing with a moving roof structure.

If a new roof appears to sag, gather the quotation, description of materials and any before-and-after photographs. The assessment needs to consider the supporting structure as well as the recently fitted covering. The age of the installation alone does not explain whether the issue is the deck, fixing work or an existing structural condition.

For an older roof, a gentle longstanding dip is not automatically an emergency, but its safety cannot be confirmed from appearance alone. A changing dip, loose materials or visible distress should not be ignored. Keep away from affected areas if you are concerned about stability, and seek urgent appropriate help if there is an immediate danger to people.

We assess the roof condition and photograph what can be seen, with a structural-engineer referral where needed. Structural design is different from replacing a slipped tile or renewing underlay: the support must be understood before the work is specified. The outcome may be a targeted timber repair, a wider roofing proposal or further structural assessment.

Use the enquiry form to tell us whether the roof is pitched or flat, where the dip is and whether it has changed recently. Our free roof survey is the starting point for discussing roofing work in the North East. A written scope lets you separate the supporting repair from the covering and access, so you understand what the proposed work is meant to put right.