Understanding a leaking garage or extension roof

Start by recording where the leak appears, whether it follows prolonged rain or particular wind conditions, and whether it is close to the main house, a rooflight or an outlet. Describe previous repairs and the current covering if you know it.

A garage roof might protect stored items, while an extension roof may sit above a regularly occupied room. Explain the use of the space beneath the roof because protection, access and any proposed insulation work need to be discussed for that project.

Photographs taken safely from ground level and internal leak photographs can help explain the enquiry. Keep people clear of loose or damaged materials and avoid walking on the roof.

Repair, recover or replace: which scope is appropriate?

A small defect can sometimes be addressed without renewing the whole roof. Recovering an existing roof is a separate decision that depends on material compatibility, the condition of the roof build-up and whether the supporting structure is suitable.

Replacement may involve removal of the old covering and attention to the deck or other components. Ask Alpine to explain which parts are being renewed, what remains in place and what further work might be needed if hidden damage is found.

Where a garage has older corrugated sheets or materials of uncertain composition, disclose this before work is arranged. Material identification and any specialist handling requirements should be resolved before disturbance. This page does not offer an asbestos removal service.

Covering options and EPDM flat roofing

EPDM rubber roofing is an option for suitable flat roof systems. Its suitability depends on the substrate, the roof shape and the detail at edges, outlets and adjoining walls. The EPDM rubber roofing guide explains these considerations and links to two Alpine projects.

When discussing another covering, ask why it suits the roof and how its preparation, detailing and care requirements compare. A material choice should be supported by a clear specification for the whole proposed roof rather than a name alone.

For an occupied extension, include insulation and ventilation questions in the assessment. Ask who will confirm any applicable project requirements; replacing the waterproof layer and altering the complete roof build-up are different scopes.

Adjoining walls, rooflights and drainage

The joint between an extension roof and the house is an important part of a quotation. So are rooflight upstands, penetrations and transitions to other roof coverings. A new membrane alone should not leave an existing defective junction unresolved.

Explain any persistent standing water, overflow or blocked outlet concerns. Ask whether falls or drainage will change and which gutters, trims and flashings are included. Where neighbouring roofs or shared boundaries are involved, describe the arrangement before the scope is prepared.

Access, protection and a completed Alpine example

Give Alpine details of side access, nearby conservatories, structures below the roof and places where equipment can be positioned. Confirm scaffolding or other access arrangements, removal of waste, protection of the space beneath and the expected programme in the quotation.

Alpine's Southmead, Bristol roof replacement and EPDM case study documents a tiled roof and adjoining flat roof project prompted by leaks. Shane discussed the problems, supplied a competitive quote and Alpine arranged scaffolding. The customer was delighted with the completed work.

This regional example helps illustrate a combined roof project. For your own property, use the roof replacement quotation guide and roof inspection guide to frame the discussion.

Frequently asked questions

Can you replace a leaking flat garage roof?

Alpine welcomes garage roof replacement enquiries. Send the postcode, approximate size, existing covering and symptoms so the team can confirm the appropriate next steps.

Does the roof deck always need replacing?

No. Its condition needs assessment. The quotation should explain whether deck renewal is included and how any additional damage discovered during work would be handled.

Can EPDM be used on an extension roof?

EPDM may be suitable for a compatible flat roof system. The supporting roof, drainage and junction details need to be considered before the specification is agreed.

Will the connection to the house be included?

Ask for the adjoining wall and roof junction details to be stated explicitly in the scope. The relevant junctions should be considered alongside the new covering.

What determines the cost of a garage roof replacement?

Size, covering choice, deck condition, insulation proposals, access, drainage, rooflights and removal of existing materials can affect the quotation. Alpine should quote for the actual property and agreed scope.