How to fill awkward or large gaps around pipework or fixings

Task difficulty: A bit of skill required

When creating new holes in your walls for pipework, there are gaps remaining that are difficult and awkward to fill, such as around drainage pipes or extractor fans.

You will need

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See how it's done

Step by step process

  1. Step 1

    Step 1

    Cover all surrounding areas before you start.

  2. Step 2

    Step 2

    Put on safety glasses and protective gloves.

  3. Step 3

    Step 3

    Ensure that the gap and wall around the pipework is clean and free from grease and loose material, then mask off any cupboard or appliances close to the gap.

  4. Step 4

    Step 4

    Moisten the surface to help the foam 'cure' and expand a household plant sprayer filled with water is ideal.

  5. Step 5

    Step 5

    Remove the cap of Polycell Expanding Foam Polyfilla carefully and, holding can away from face, shake vigorously about 20 times to mix contents. Then carefully screw on the supplied applicator nozzle.

  6. Step 6

    Step 6

    Hold the can of Expanding Foam upside down and direct the applicator inside the hole, applying pressure as required Shake the can from time to time during use. The foam will expand to 2¼ times the amount you start with so take care not to overfill.

  7. Step 7

    Step 7

    After 24 hours, the foam can be cut, sanded, plastered or painted over.

  8. Step 8

    Step 8

    For interior areas finish the task by using Polycell One Fill Polyfilla to create a perfectly smooth surface for painting.

  9. Step 9

    Step 9

    Remove the lid and stir into a smooth paste.

  10. Step 10

    Step 10

    Press the filler into the gap using a filling knife, and smooth off with a wet knife. This lightweight filler leaves a perfectly smooth finish that should require no sanding.

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