Brick & Block
Wall area → bricks/blocks + mortar
Reading 5 m
Reading 2.4 m
A standard door is about 1.9 m², a window 1 to 2 m².
Reading 5 %
Bag count is the same for all wet-mix options — only changes the type sold.
Adds the right finish + primer to the materials list.
Results
What to buy — 3 items
Opens at Screwfix, Toolstation and the merchants for your trade. Free account, no card.
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A free account gets you the Gaffer for the awkward questions, a checklist for the job with every part on a shopping list, and quotes and invoices you can build and price up. Sending them out is Pro. No card needed.
Create your free accountIndicative design aids — the main figures and where each comes from are listed under "Figures based on" below.
Figures based on
- 60 bricks per m² single skin, 120 cavity, 10 blocks per m²: Typical — the trade convention for 215 × 102.5 × 65 mm bricks and 440 × 215 mm blocks at 10 mm joints (Travis Perkins' brick calculator uses 60 and 120 per m²). Check your unit size
- Mortar 45 kg/m² single skin, 90 cavity, 48 handmade; blocks 22 / 30 / 40 / 48 kg/m² by thickness: No source — workshop estimate: a fixed estimating assumption. UK merchant figures range from about 0.022 to 0.03 m³ of mortar per m² of half-brick wall; check the coverage on the mortar bag
- Thin-joint mortar at 35% of conventional: No source — workshop estimate: a fixed estimating assumption. Check the block adhesive maker's coverage
- Hydrated lime, one bag per four of mortar (1:1:6): No source — workshop estimate: a fixed estimating assumption
- Wall ties 5 per m² (cavity): No source — workshop figure: a fixed estimating assumption. The usual tie spacing of 900 mm across by 450 mm up is about 2.5 per m², with extra ties at openings (Wienerberger Porotherm best-practice guide), so this allows about twice that. Follow the wall design and the tie maker
- Cavity trays 4, weep vents 8, DPC in 30 m rolls: No source — workshop estimate: fixed estimating assumptions. Count the trays and weeps from the actual openings
- Finish coverage (render 1.2 m² a bag, masonry paint 7 m² a tin ...): Typical — no data sheet retrieved. Check the coverage on the product
- Waste allowance: No source — workshop estimate, adjust to suit: an input (default 5%)
Indicative design aids. A standard is named with its edition; each is still to be checked against the published text. "Typical" means no standard sets it: check the bag, tin, data sheet or supplier named. "No source" means a workshop estimate: adjust to suit, or, where the box says it is fixed, a fixed estimating assumption.