How do you fit a cavity closer?

Cavity Closer fitting guidelines

There are two ways to fit a cavity closer – either first or second fix, both are detailed below.

FIRST FIX

When building cavity closer into the brick/block work using a timber former or window.

Products: TF1000, TF2000, TFR1000, TFR2000, TF Multi – Standard and Check Reveal.

1. If using a timber former, make an accurate timber template the same size as the structural opening.
2. Cut closer to the size of the sill and jamb adding a minimum of 50mm run on at the base of the jambs.
3. Tack/nail the cavity closer to the window or former along the sill and jamb ensuring the run on is at the base of the jamb.
4. Remove the relevant flanges on the run on so you are left only with the cavity width portion.
5. If building in the window, position the frame with 30mm overlap of cavity closer from the inside of the outer skin. (For Check Reveal installations position the closer flush with the outside of the window, with the closer’s single flange projecting to the inside).
6. Build the inner and outer skins up to the sill level.
7. Position the window/former with the cavity closer attached onto the sill in the required position.
8. Ensure the timber window/former is level and upright then prop up in position.
9. Build up the two skins ensuring that they butt up tight to the closer.
10. Use a Dacatie fixing tie every 225mm alternating between the two skins as you build up to the height of the window/former.
11. For check reveal installations, build inner skin up to the inside flange of the cavity closer and butt to the outer skin – allowing for the required check reveal overlap.