Guides
Cold Climate Shingle Quotes: What Canadian Roofers Add for Ice and Water Shield
Ice water shield roofing quote Canada explains Ontario Building Code eave protection and Quebec cold rules. Roofers learn what to add and when to stop.
What to take away
- Ontario's Building Code and Quebec's Construction Code require self-adhered eave protection on cold zone shingle roofs; the exact slope and temperature trigger is set out below.
- Quebec quotes carry the membrane as its own contract line, and the RBQ inspector can ask for it.
- A cold climate quote that omits ice and water shield is not a valid quote. It is a spring leak waiting to appear.
- More felt or a synthetic underlayment is not an acceptable substitute for the membrane in a Canadian cold zone.
The measurable limit is the January 2.5% design temperature used in Canadian building codes.
The measurable cold limit
For an ice water shield roofing quote Canada, the trigger is not a guess. Ontario's Building Code Article 9.26.5.1 makes the trigger concrete.
For shingle roofs with a slope of 1:3 or less, or for areas where the January 2.5% design temperature is below -5°C, the code requires a self-adhered bituminous eave protection membrane.
Ottawa's January 2.5% design temperature is typically near -25°C, and Montreal's is typically near -23°C. Both sit well below the -5°C line.
The membrane must run from the roof edge up the roof interior to a point at least 900 mm above the inside face of the exterior wall.
In Quebec, Chapter III of the Construction Code mirrors this eave protection rule for the Montreal, Quebec City, and Saguenay temperature zones.
That measurable limit rules out a quote that only lists a generic synthetic underlayment on a 4/12 roof in Ottawa or Quebec City.
Two inputs decide what the quote must carry.
| Roof slope | January 2.5% design temperature | What the quote must carry |
|---|---|---|
| 1:3 or flatter | Any | Self-adhered eave protection, at least 900 mm up from the interior face of the exterior wall |
| Steeper than 1:3 | Below -5°C | The same eave protection; the temperature triggers it on its own |
| Steeper than 1:3 | -5°C or above | Eave protection not triggered; felt or synthetic underlayment at the eave is acceptable |
Cold Climate Eave Protection Triggers
- 13 or less roof slope trigger
- -5°CJanuary 2.5% design temp
- 900 mmmembrane above wall face
A quote that lists underlayment but not self-adhered eave protection is missing the only code line that stops an ice dam.
What eave protection rules out
Ice and water shield rules out the standard felt-only quote. An ice dam forms when meltwater refreezes at the roof edge, lifting shingles and driving water under them. Ice dam formation explains why the membrane must seal to the deck.
In a Canadian cold climate quote, the item 'self-adhered eave protection' is not an upsell; it is a code line. A roofer who quotes only 15 lb felt or a synthetic underlayment on the lower meter is removing the only layer that stops backed-up meltwater.
Felt-Only vs Self-Adhered Eave
Felt-only quote
- Ice dam seal
- No
- Code line
- Missing
- Meltwater backup
- Leaks under
Self-adhered eave
- Ice dam seal
- Yes
- Code line
- Required
- Meltwater backup
- Blocked
The line items a cold quote adds
A cold climate roof quote items list should separate the membrane from the field shingles. Common lines on an Ontario or Quebec re-roof include:
- Self-adhered eave protection membrane, at least 900 mm up from the interior face of the exterior wall
- Self-adhered membrane in valleys, at wall junctions, and behind dormers and chimneys
- Metal drip edge set over the membrane at the eave
- 30 lb felt or synthetic underlayment for the field deck above the membrane
- Hip and ridge caps run in the same shingle line as the field
- Roof ventilation, intake and exhaust, quoted as its own line
- Fastener seal note, because nails pass through the membrane and are sealed with polymer-modified bitumen
- GST/HST as a separate percentage line
Cold Climate Quote Line Items
- Self-adhered eave protection, 900 mm minimum
- Valley membrane, full width, 500 mm each side
- Wall junction membrane, 150 mm up under siding
- Fastener noteseal nails below membrane line
- GST/HST as separate percentage line
Soprema SopraStick and IKO ArmourGard are common Canadian membrane names on cold climate quotes. As an illustrative range, a 75 m² roll adds $150 to $240 CAD in material at Ontario roofing distributors.
Labour is the larger line. Typical range: a detached house takes 3 to 5 crew hours to lay the eave and valley membrane. At a typical Ontario or Quebec billed rate of $65 to $110 CAD per hour, the installed membrane line lands between $350 and $800 CAD before tax.
Roof perimeter, valley count, dormers, and access move that figure. Ask for the membrane as its own line so quotes compare.
Unlike plain asphalt felt, self-adhered polymer-modified bitumen membrane sticks to the deck and seals around nails. Underlayment defines the general layer, but the Canadian shingle underlayment code line is the self-adhered type.
After membrane lines, Canadian roofers add GST/HST as a separate percentage; see GST/HST and provincial licensing.
What stays: felt, drip edge, ventilation
Upper roof felt still works above the 900 mm eave line. A 30 lb felt or synthetic underlayment is acceptable there. Metal drip edge works along the eave over the membrane. Hip and ridge caps work with the same shingle. Ventilation remains a separate line. These items can stay in a cold climate quote without changing the code requirement.
Compromises that hold, and ones that fail
Three compromises hold up on a cold quote. Use primer only where the deck is dusty or old, since fresh plywood does not need it. Keep the membrane on both eaves and in the valleys rather than across the whole field on a steep 8/12 roof.
Order the eave band at the code minimum width instead of a wider roll. That cuts material cost with no loss of cover. For an Ottawa winter schedule, see Ottawa winter scheduling.
Worthwhile Cold Quote Compromises
Compromise
- 900 mm vs 1.8 m
- Slope above 1:3, below 1:2
- Primer only
- Dusty or old deck
- Eaves only
- Steep 8/12 roof
Condition
- 900 mm vs 1.8 m
- Primer only
- Eaves only
Cutting the membrane to 600 mm on a 4/12 roof is not worth it. An inspector can require tear-off of the lower courses. Omitting the wall junction membrane behind a dormer or chimney is not worth it either; ice damming there sends water indoors in March, after final payment.
A liquid-applied membrane in place of a sheet product on a new deck is the third risk. Thickness control is worse, and most Canadian inspectors require a sheet product. In Quebec, a roofer who skips the membrane on an RBQ project risks a corrective order; see Quebec roofing quotes.
Compromises That Fail Inspection
Cut
- 600 mm on 4/12
- Tear-off of lower courses
- Omit wall junction
- Water indoors in March
- Liquid-applied membrane
- Thickness control, inspector rejection
Risk
- 600 mm on 4/12
- Omit wall junction
- Liquid-applied membrane
When to stop and do it properly
The threshold in the table above is the stopping point. A quote without self-adhered eave protection does not meet the code. The rule also applies after the first ice dam leak.
Once water has stained the ceiling, or the lower roof deck has wavy felt, patching a few shingles does not fix the missing membrane. Stop and quote the full cold climate package: eave membrane, valley membrane, wall junction, drip edge over membrane, and a fastener seal note.
If the building is in Toronto, the permit and dump fee sequence is handled as its own line; see Toronto Building permits.
