Sheet goods
1/2 in exterior gypsum sheathing × 4 × 8 ft
Verify the exact product technical data.
Good choice when…
A good candidate when use, exposure, dimensions and every system component match the documentation.
Avoid when…
A poor candidate when compatibility must be improvised, damage hidden or a regulated component replaced without validation.
Reference data
| Purchase unit | sheet |
|---|---|
| Coverage | 2.9729 m² |
What the numbers mean
- Stated coverage: 2.9729 m² before waste; use the exact package for final ordering.
Recommended uses
- For panels, sheathing, subfloors or cabinets where thickness, span and exposure match the product.
- For a large flat surface with a cutting plan that respects strength or finish direction.
- For assemblies with supported joints and the specified edge gaps and fasteners.
When to avoid this material
- Avoid direct water or prolonged moisture if the panel is not designed for that exposure.
- Do not assume panels of equal thickness have equal strength or rating.
- Avoid swollen edges, delamination and panels stored in a bowed condition.
Compatibility and installation
- Confirm adhesives, screws, nails, primers and membranes compatible with the exact panel.
- Respect edge gaps, staggered joints, perimeter support and the adhesive/fastening sequence.
- Protect exposed edges as required; a finish layer does not fix a wet panel.
Storage, care and service life
- Store horizontally on closely spaced supports, dry and out of direct sun.
- Capture dust at the source and use respiratory protection suited to the material and cutting method.
- Replace swollen or delaminated areas rather than hiding them under a finish.
Common mistakes
- Cutting without continuous support, causing face tear-out or blade pinching.
- Forgetting panel orientation, staggered joints or expansion gaps.
- Using an interior panel as a temporary exposed surface and closing it after wetting.
Alternatives to compare
- Compare OSB, plywood, MDF, cement board and specialty panels for structure, water, weight and finish.
- Greater thickness does not automatically replace the correct rating or assembly.
Before purchase
Confirm exact size, coverage, certification, compatibility, lot and instructions. This sheet helps you ask the right questions; it does not make two similar products equivalent.
Dated observations
Full comparisonObserved public prices
| Retailer / product | Location / date | Price | Unit price | |
|---|---|---|---|---|
| CanacPanneau DensGlass 1/2 po × 4 × 8 pi | L’Ancienne-Lorette / Québec web price2026-08-01 | 38.25 $ / sheet | 12.87 $ / m² | Verify |
| McMunn & YatesGlass-mat exterior panel 1/2 in × 4 × 8 ft | Prairies — confirm selected store2026-08-01 | 52.80 $ / sheet | 17.76 $ / m² | Verify |
| RONAExterior gypsum sheathing 1/2 in × 4 × 8 ft | Scarborough — RONA+ Golden Mile2026-08-01 | 55.44 $ / sheet | 18.65 $ / m² | Verify |