Roofing Quote: Decking Allowances and Hidden Damage

Roofing Quote: Decking Allowances and Hidden Damage

Quick answer

A roof quote may include only the sheathing visible before tear-off. Ask how hidden rotten, delaminated, or noncompliant decking will be documented, priced, and approved. A useful agreement states the unit price for replacement sheets or square feet, labour and disposal inclusions, and who may authorize extra work. Do not rely on a vague “as required” allowance.

Atlas-Apex Roofing Inc. / atlas apex toronto

TorontoOntario

65 Disco Rd, Etobicoke, ON M9W 1M2, Canada

Before signing

Decking supports the roof covering, but much of it cannot be inspected until shingles or another membrane are removed. Before accepting a proposal, confirm:

• what material and thickness the base price assumes;
• whether the quote includes a stated decking allowance;
• the unit price for work beyond that allowance;
• whether taxes, fasteners, labour, disposal, and delivery are included;
• how photos and measurements will be provided;
• who can approve a change order and how approval is recorded;
• what happens if widespread damage changes the schedule.

Ask the roofer to distinguish a provisional allowance from a fixed price. Also ask whether local permit or inspection requirements could affect the repair method. Product instructions and applicable building rules should guide fastening, panel spacing, and acceptable substrate conditions.

Edmonton Roofing Company / replace roof edmonton

EdmontonAlberta

8023 182 St NW, Edmonton, AB T5T 0T6, Canada

During tear-off

1. Request overview and close-up photos before damaged decking is removed.
2. Ask for a count of full sheets plus any partial-area measurement.
3. Compare the finding with the contract allowance and unit price.
4. Receive a written change order before additional work proceeds, except where an agreed emergency provision applies.
5. Keep the final invoice, photos, and material description with the roof warranty documents.

A contractor should not cover unsafe or unsuitable decking merely to preserve the original price. At the same time, a homeowner should not be asked to approve an unexplained lump sum while the roof is open. Clear documentation lets both parties make a timely decision.

Limits and warning signs

A pre-work attic or exterior inspection can reveal staining, sagging, soft areas, or ventilation concerns, but it cannot rule out concealed damage. Weather can also limit how long a roof may remain exposed. Pause and seek clarification if the proposed scope changes substantially, if measurements are unavailable, or if payment is demanded without a written change order.

Structural movement, extensive mould, fire damage, or widespread decay may require an engineer, qualified remediation professional, or other specialist. Roofing advice is not a substitute for an on-site assessment or local code interpretation.

Frequently asked questions

Should every roof replacement include new decking?

No. Sound, compatible decking may remain, while damaged or unsuitable sections may need replacement. The decision depends on actual condition, the new roof system, manufacturer instructions, and applicable rules.

Is a per-sheet price enough?

It is useful only when the sheet size, material, thickness, labour, fasteners, disposal, taxes, and treatment of partial sheets are clear.

Can I set a spending limit?

You can require written approval above a stated amount. The contract should also explain what happens if stopping would leave the building exposed or unsafe.

Sources and evidence

Use the current Ontario Building Code requirements applicable to the project, the selected roofing and sheathing manufacturers’ published installation instructions, municipal permit guidance, and the written contract. For a dispute or uncertain structural condition, consult the appropriate local authority or qualified professional.

Next steps

Before work begins, add the decking allowance, unit price, photo process, approval threshold, and invoice detail to the written proposal. During tear-off, review documented findings promptly and keep the approved change order with the completed project records.