202-INST-US-001 v1.0
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11 Dec 2020
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Page 12 of 25
Step 2
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Install the Sill Tilting Fillet
Install a tilting fillet as shown (not supplied) - Glazing Vision recommends that a hardwood or treated softwood fillet is used. The sill
tilting fillet should be at least the length of the external width of the product and have a minimum 5° fall over the fillet. Consider the
distance required between the sill of the product and the fillet (figure 2
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gap A), and also the height of the fillet. Fix the fillet to the rafters.
Figure 2
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Sill tilting fillet installed
The purpose of the tilting fillet is to support the flashing at the sill of the product. Lead used for flashing must be
supported or it will sag over time, allowing water to pool or even to run underneath the tiling to the sides of the product.
Step 3
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Prepare and Install the Sill Flashing
Using either the sill flashing supplied as part of the flashing kit (if specified), otherwise use
0.042”
thick flashing lead, fit the sill flashing.
The flashing should be at least 11-
3/4”
longer than the external width of the product and should be installed centrally. For sunken
installations the lead should extend beyond the sunken detail on either side, dressing it neatly up and over the step. The flashing should
lap under the sill of the product by at least
2”
but should not overlap the butyl tape to be applied in step 4. Apply silicone underneath
the flashing, and if required fix the flashing in place using brass or stainless steel tacks (not supplied).
Figure 3a
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Sill flashing in position
Figure 3b
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Sill flashing detail for a sunken installation
Sill fillet (primary)
Gap A
Sill flashing
Flashing length
