Plan the Ground, Wall and Insulation Layers

Inventory the crawlspace assembly

Record whether the crawlspace has exposed soil, a membrane, concrete, wall insulation, floor insulation, vents, ducts, pipes, equipment and usable access. Note approximate locations and visible condition without removing finishes. This inventory prevents one material from being discussed in isolation and gives the estimate a common drawing of the ground, wall, rim and floor zones.

Address active water before covering surfaces

Standing water, plumbing leaks and repeated exterior inflow need their own source and drainage review before new layers hide the condition. Natural Resources Canada advises correcting sump or sewer-backup problems before insulation work. Ask how the area will be dried, what evidence confirms readiness and who decides whether damp wood, insulation or other material can remain.

Record ground-membrane continuity

Note exposed areas, seam direction, tears, penetrations, wall transitions, support posts and access routes from a safe position. Do not lift the existing layer simply to inspect beneath it. A proposal should explain material thickness, seam treatment, terminations, protection at traffic areas and how future inspection or servicing will occur. Product name alone does not describe a complete moisture-control detail.

Review insulation location and condition

Identify whether insulation is at the floor, wall, rim area or more than one location. Record sagging, compression, staining, missing sections and contact with wet surfaces without disturbing material. Ask how the proposed thermal boundary relates to air sealing, moisture control, mechanical equipment and current code requirements. Wet or suspect material needs condition-specific review before replacement is specified.

Separate ventilation observation from design

Record existing vents, fans, ducts and seasonal condensation, but do not assume that opening, closing or adding ventilation is the right correction. Air movement, outdoor humidity, surface temperature and the chosen thermal boundary interact. The proposed assembly should explain its ventilation and humidity assumptions, not merely state that a crawlspace is ‘sealed’ or ‘vented.’

If a fuel-burning furnace, boiler or water heater is in or connected to the crawlspace, identify its air inlet, vent route and service access before accepting an air-sealing scope. Ask the appropriate qualified contractor to review combustion and ventilation air, venting and clearances affected by the proposed work. Do not cover, close or reroute an appliance opening yourself. Technical Safety BC's gas-appliance service checklist treats venting and adequate combustion/ventilation air as separate checks; a membrane or insulation proposal does not establish that those checks are complete.

Check code, permit and energy requirements

The Province publishes the current BC Building Code, while the relevant municipality or CVRD administers permits and inspections for the property. Requirements depend on the work and building. Courtenay and the CVRD publish separate permit information. Confirm the correct authority, code edition, required drawings and inspection stages before relying on a generic detail or rebate assumption.

Define installation and closeout evidence

Ask the scope to identify preparation, material, attachment, seams, penetrations, transitions, access protection, waste removal and exclusions. Request completion photographs of covered details and product documentation for installed materials. Record who will check moisture conditions, drainage dependencies and any electrical or mechanical changes. Closeout evidence makes later maintenance possible and shows whether the proposal was installed as described.