Roofs that dip in Midhurst: what is going on?
A wavy roofline or a ridge that sags is more than a cosmetic issue. It often points to structural stresses that need attention. In and around Midhurst we see this on cottages, post‑war homes and newer builds. Here is why roofs dip and how we put them right safely and neatly.
If you need quick advice or a local survey, our Roofing Midhurst team is ready to help.
Common signs to look for
- A ridge that bows or dips
- Rafters that look curved when viewed from the loft
- Tiles stepping or gaps opening at the eaves
- Cracks at the tops of internal walls
- Doors sticking below the loft space
Why roofs dip
Failed or decayed timbers
Long term leaks, poor ventilation or past infestations can weaken rafters, purlins and wall plates. Once fibres soften, the timber deflects under normal loads and the roofline sags.
Undersized rafters and missing support
Older Sussex homes sometimes have slender rafters that were fine for light slate but not for heavier concrete tiles added in later decades. Without a correctly sized purlin and struts, long spans bow with time.
Roof spread at the eaves
When collars or ceiling joists that act as ties fail, the rafters push outwards and the ridge dips. Rotten wall plates, missing restraint straps or weak gable ends can make this worse.
Inappropriate past alterations
Loft storage platforms, removed load bearing walls or cut truss members can overload parts of the roof. Even extra insulation piled high can hide leaks that decay timber.
Decking issues on flat areas
On dormers and small flat roofs, wet OSB or ply loses stiffness. The deck sinks between joists and the dip telegraphs through the felt or EPDM.
How we fix a sagging roof
Survey and diagnosis
We begin with a careful survey. We check moisture levels, timber condition and spans. We identify whether the dip is cosmetic, structural or both. For larger interventions we can work with a structural engineer and handle Building Regulations where required.
Strengthening the structure
- Sistering rafters with new treated timber to restore stiffness
- Adding or upgrading purlins with proper struts to load bearing walls
- Fitting new collars or ties to stop spread
- Replacing rotten wall plates and adding restraint straps to gables
- Local steel beams where spans or loads demand it
Re roofing and weathering
Once the frame is sound we re set the line of the roof with new battens to BS 5534, a breathable underlay and correct fixings. If weight has caused the problem we often recommend returning to natural slate or clay tiles to suit Midhurst homes. For flat areas we replace softened decking and finish with a quality single ply or EPDM system with proper falls.
Heritage and conservation
Much of Midhurst sits within the South Downs National Park and has many listed or period properties. We match traditional materials, maintain original details and coordinate any consents. Your roof looks right and performs as it should.
Costs and timescales
Minor strengthening and tile replacement can take two to five days. Structural upgrades with purlins, ties and re roofing may run one to two weeks depending on size and access. We provide a clear written quote, programme and photographs of the work as it progresses.
Prevention tips
- Keep gutters clear and fix leaks quickly
- Ensure loft ventilation to avoid condensation
- Do not overload the loft and never cut truss members
- Replace broken tiles and perished underlay before rot sets in
- Choose appropriate tile weights for the existing structure
Why choose us in Midhurst
We are local, experienced and tidy. We combine sound structural repairs with neat roofing so the bay window lines up, the ridge runs straight and the home stays dry. All work is backed by warranty and completed with safety and care for your property.
Arrange a survey
If you have a sagging ridge, a wavy roof or signs of spread, book a visit. Speak to the local Roofing Midhurst team for straight advice and a practical plan to restore your roof.