Signs You Need a New Roof — 10 Warning Signs Salisbury Homeowners Should Know

Most Salisbury homeowners only call a roofer when there is an obvious leak or visible damage. But by that point, the problem has often been developing for months or years. Knowing the early warning signs means you can act before water has caused secondary damage to ceilings, joists and insulation — which always costs more to fix than the roof itself.

Here are the 10 most reliable warning signs that your Salisbury roof needs professional attention.

1. Slipped or Missing Tiles

The most visible sign. One or two tiles slipping after a storm is usually straightforward displacement — a repair job. Multiple tiles slipping progressively over months, particularly on 1960s–70s properties, is nail sickness and indicates widespread fixing failure. Either way, loose or missing tiles expose the felt underlay, which is not designed to be the primary weather barrier and will fail within months if left exposed.

The NFRC recommends professional roof inspection every five years for properties over 20 years old, and every three years for those on exposed sites, to catch developing failures before water ingress begins.

— NFRC maintenance guidance

2. Daylight in the Loft

Take a torch into your loft on a bright day and turn it off. If you can see daylight through the roof structure, there is a gap somewhere in the tile course, ridge line or hip. This is a definitive sign of tile displacement, cracked tiles or failed mortar. Do not ignore it — any gap that lets in light also lets in water and wind-driven rain.

3. Damp Patches on Ceilings

Brown or yellow staining on your ceiling after rain is the classic indication of roof water ingress. The leak source is rarely directly above the stain — water tracks along joists and felt before dropping through. A damp patch on a first-floor ceiling after rain almost always has a roof origin, even if the stain is some distance from the roof edge.

4. Sagging Roof Deck

If the roof surface appears to dip or sag when viewed from across the road, the roof deck — the boarding or sarking beneath the tiles — may have softened from sustained water ingress or from structural failure. This is a serious structural issue requiring immediate professional assessment.

5. Ridge Tiles Moving or Missing

Ridge tiles sit at the highest point of the roof, mortared onto a bed of sand and cement. When this mortar fails — which it does over 20–40 years from freeze-thaw cycling — ridge tiles rock under wind loading and can become a safety hazard. A ridge tile falling two storeys is a serious risk. Check from ground level whether your ridge line appears straight and regular.

6. Granules in the Gutters

If you see significant sandy granules or tile fragments in your gutters or on the ground after rain, it indicates that tile surfaces are eroding. On concrete tiles this happens as the tile approaches the end of its serviceable life, exposing the aggregate beneath. This is an indicator that the tiles are in the last quarter of their useful life.

7. Moss, Lichen and Algae Covering Large Sections

A small amount of moss is cosmetic on most roofs. Significant coverage, particularly where moss has lifted tile edges or is growing into valleys and flashings, can cause water retention and tile displacement. On New Forest fringe properties in Whiteparish, Redlynch and Downton, heavy moss coverage is the most common maintenance issue we see.

8. Failed or Patched Lead Work

Lead flashings at chimney bases, in valleys, at dormer junctions and along parapet walls have a long service life when correctly installed — but become a primary leak source when they fail. If your lead has been patched with sealant compound rather than properly reformed, the patch has a very short life and the underlying issue remains. Sealant on lead is a temporary fix, not a repair.

9. Roof Is Over 40 Years Old With No Major Work

A concrete tile roof installed in the 1970s that has had no major work is now at or past its expected service life for the original fixing specification. It is not necessarily failing yet, but a professional inspection will reveal whether nail sickness, felt condition or mortar deterioration has reached the point where a re-roof is approaching. Prevention — knowing before a problem develops — always costs less than reaction.

10. High Energy Bills (Flat or Low-Pitch Roofs)

Failing flat roof insulation, or a flat roof membrane that has separated from the insulation layer below, allows cold bridging that increases heating costs. If you have a flat-roofed extension and notice unusual cold or damp in the room below, the flat roof is a likely contributor.

Last reviewed: 21 July 2026 by Salisbury Roofing Experts