THE CAST CONSERVATION ROOF LIGHT

We are very pleased to be an associated fitter recommended by Clement Steel Windows to fit their roof lights.

These are the basic instructions showing how to fit their cast conservation roof lights:

 To conform to local regulations there must be a double rafter either side of the opening that the roof light is going to be placed in. The width of the opening can easily be assessed by unpacking the new window and turning it over so that you are looking at it from the inside. You will easily notice the fixing lugs on either side.

 Measure from inside of lug on the left hand to the inside of the lug on the right hand side and add 10mm. This will be the opening that the rafters are set to. When you have done this, set the bottom and top trimmers into place, allowing for whatever lining you intend to use. It is important that the opening is square.

 It may be that the roof is counter battened or boarded. None of these conditions matter. Just remember that the top of the kerb on the outer edge of the window frame is set at exactly the same height as the top edge of the roof battens.

 Felt right up to the bottom of new opening. 

 Batten out as per normal depending on what material is used. Leave off the final battens set below the opening as shown in photo.

 Supply and secure new Code 5 x 450mm lead apron using copper nails. The lead should be secured only below the opening and flash up to the top of the bottom trimmer. The lead apron should be 100mm longer than the frame at either end.

 Fit the new frame into the opening and press down to ensure a nice tight and level fit (no gaps) underneath and secure the window in place with screws provided.

 Gently turn the lead apron up to 90° and place a piece of plywood 5mm thick so that it touches the bottom of the frame and the final course of tiles or slates laid below the opening. Push the lead back down on to the plywood.

 Using a plastic lead dresser, flatten the lead against the plywood. You will notice that a natural kerb will be formed at either end where the final battens where trimmed back. The upstand here will act as a useful water channel. The excess lead at either end should be trimmed back and the outer edge turned over. This will prevent all sideways water ingress.

 On completion of this work, coat the new lead with paternation oil.

 Felt and batten up either side of window and above. The battens must finish flash with the top of the kerb of the frame.

 Trim the felt so that it finishes just past the inside edge of the frame kerb. Stick the felt down to the top of the kerb with silicon. This will give you overnight protection from rain depending on how far the fit of the window has progressed.

 Be fussy about weathering around the frame as this is the most vulnerable time of the fit if let exposed for awhile.

 Start laying the tiles or slates up either side of the window. From the bottom, place the first tile or slate so that it overlaps the kerb of the frame by 10mm - 15mm. Fit Code 3 x 225mm lead, cut into soakers. The size is compliant to the material being used.

 Locate each soaker as follows - holding the lead in one hand, let it rest on the edge against the window frame base. It should touch the frame all along its length. Whilst holding it in this position, with one hand press the lead down over the tiled laid. The soaker should then be secured through the face of the batten above. The bottom of the soaker should be located at whatever the gauge of the tile or slate is set. The length of it is determined from this point up to the face of the batten above the tiled or slated course laid. It must also touch the bottom of the frame and lay over the tile or slate by 150mm.

 Nip off any lead that shows below the course of materials laid. Repeat this process up to the top of the frame on both sides.

 At this point, you will discover at what height the eaves over the top of the window will be. Fit a batten at this exact thickness and fix immediately above the head of the frame.

 Cut a length of Code 3 lead and fix into place so that when it is turned down it touches the frame base and then secure it through the appropriate batten face.

 Finally, lay eaves over lead head of window and proceed to tile or slate as normal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

26.10.2008 - Conservation Lights - Prepared by Andy Fly, A & J (Roofing) Building Works