How much grow room sheeting do you need? Plan your cuts

Measure each surface separately

Record width and height for each wall or other lining surface. Mark corners, doors and openings. Choose a strip direction and decide how to fix edges and seams. Use actual dimensions of black and white sheeting or Anti sheeting.

Divide the width into strips

Roll width sets the maximum strip width. Overlap reduces the useful coverage of the next strip. Round the number of strips up. Do not count a door or window cut-out as a saving until you know you can reuse that piece elsewhere.

Example: a surface measuring 3 × 2 metres

Use vertical strips 1.20 metres wide for this example, with 5 cm overlap between them. Three strips cover 3.60 − 0.10 = 3.50 metres in width. If you allow 10 cm at both top and bottom for your chosen fixing, each strip is 2.20 metres long. Three strips therefore need 6.60 metres of roll length before other cutting waste.

These overlaps and allowances are calculation choices rather than universal fitting instructions. Match them to the material, fixing and surface. The calculation changes without overlaps or edge allowances.

Add the strip lengths for every surface

Apply the same method to each surface. Ten strips of 2 metres use 20 metres of roll length before allowances. Sort strips by length and check whether offcuts are useful. Choose a roll that accommodates the final sum and your actual cutting waste.

Use square metres as a check

Gross areas are 2 × 25 = 50 m², 1.20 × 30 = 36 m² and 1.20 × 60 = 72 m². They do not account for strip layout. A wide, short offcut does not automatically replace a long strip. These figures are not growing area recommendations either.

Keep the plan for fitting

Number the strips and record their positions. First use an offcut to check the sheeting and tape against the surface. Read the fitting checklist, then compare the available sheeting rolls.