Slate roofing · A focused guide

How should a quotation allow for salvaged slates and replacements?

Published by Big Ben Roofing Ltd

A quotation using salvaged slates should explain the intended retention strategy and the allowance for unsuitable or broken pieces. A promised reuse percentage needs a clear basis and should not conceal uncertainty about condition. Ask how actual quantities will be recorded after lifting and when you will approve extra material. Keep the selection of replacement slate, ownership of retained spares and waste removal visible in the written scope.

Separate estimates from measured findings

Before lifting, a contractor may only be able to estimate how much covering can be retained. Ask what that estimate assumes and which evidence supports it. Once the roof is accessible, photographs and a simple record of retained and rejected pieces can explain a revised quantity. Agree a contact for decisions so unexpected replacement needs can be discussed without leaving the approval process unclear.

Confirm where retained material will go

Ask whether reusable slates return to their existing section, are regrouped within an agreed area or are held as spares. This affects appearance and the quantity of new material required. The replacement specification should still suit the roof arrangement. Confirm that disposal applies to rejected material, and discuss any storage request before work starts rather than relying on informal instructions on site.

Useful details to record

Ask what the initial reuse estimate assumes about concealed damage.
Agree how retained and rejected slate quantities will be documented.
Confirm the replacement selection before additional slates are ordered.
Record the arrangements for ownership, storage and disposal of remaining material.

Use information already available from indoors or ground level. Do not climb onto the roof or disturb materials to complete this checklist.

Is the cheapest quote always the one assuming the most slate reuse?

An optimistic allowance can leave additional costs unresolved. Compare the inspection evidence, replacement assumptions and approval process as well as the initial price. A clear method for recording actual condition makes the proposal easier to assess.

Background reading

General guidance helps frame the questions. The cause, suitable materials and scope depend on inspection of the particular roof.

Discuss what you have noticed

Include your postcode, the affected roof section and when the concern appears. The team will review the enquiry and confirm the next step, scope and availability.

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