Good surveying is essential to ensure a trouble free successful installation, also to avoid costly remakes caused by incorrect measuring.
When surveying it is the surveyor’s responsibility to determine that the structural openings and surrounding areas are in a state of good repair and provide the correct dimensions for manufacture.
It is not possible to provide full comprehensive surveying instruction to cover every eventuality, the following basic notes are for on-site surveying guidelines:
For all configurations of door and windows carry out the following:
1. Check the brickwork around the opening for any defects.
2. Check if any provision needs to be made for telephone or TV cables. Advise the customer of these facts before proceeding.
3. Take several measurements across the opening to find the narrowest point, having taken care to measure beyond any existing sub-frame or packing. Deduct 10mm from this dimension to give the finished width. (5mm allowance for expansion on each side).
4. Measure the height of the opening in the same way as detailed above and deduct 10mm for expansion.
5. Take a note of any existing cill and establish if this is to be included in the overall frame dimension (eg. stone cill). If the cill is to be replaced take a note of the depth of the existing reveal and determine which cill is most appropriate (i.e. 180mm, 150mm or the 85mm cill).
6. Check the opening is square – it is important that the diagonals are no more than 10mm different, if they are then remedial work may need to be carried out on the brickwork to ensure the opening is square.
7. If the window is fitted deep into the reveal check to see if the extension blocks are necessary to ensure that the sash operates and is not impeded.
8. If the customer has chosen a style of window, the surveyor must check to see if the styles are suitable for the intended application.
Surveyor must check:-a) That the units are within the supplier’s specification.b) That the units are within the max/min size limitations.c) That the windows will perform as designed.d) That the windows are acceptable to the customer.e) That all windows meet the requirements of current legislation.
9. The responsibility for re-plastering, fitting of curtain rails, blinds or other fittings or fixtures must be discussed and agreed with customer.
2. Removing the previous framework
1. On arrival, before removing any existing window frames, check that the replacement frames size is the same as the existing window frames. When checking the sizes, ensure that the new frame has a 5mm expansion gap around the perimeter.
2. Once you’re sure your measurements are correct, proceed to remove the old window frames.
3. Run a sharp blade around the inside perimeter of the window to break the bond between frame and the plaster. This will also minimise the damage to any interior decoration.
4. Remove as much glazing as possible, this will help to reduce the weight and alLow Energyasier handling.
5. Remove and old fixings and break the external silicone seal with a blade. Also remove the external brick corners, to release the old frame.
6. After the removal of the frame, remove all sealant and debris from the brick work.
7. Check that mortar bed has sufficient Clearance, if not remove it.
8. Prepare the external cill for fitting to the new frame. This can be done one of two ways, either fitted full width or rebated around the brick work to achieve a neat finish.
3. Fitting the new window frame
1. Remove any packaging from the new frame and screw the cill onto the bottom of the frame. Make sure you select a screw that will not penetrate the inner skin of the frame.
2. Be sure to seal the ends of cill and frame assembly to prevent moisture from tracking along the cill and into the brickwork.
3. Carefully position the new frame into the aperture. Centralise it and insert packers underneath to level it and maintain the 5mm expansion gap.
4. Check that frame is both level and plumb, then drill fixing holes into the frame sides. These should be drilled approximately 150mm from the top and bottom corners and approximately 600mm in between (a minimum of 2 fixings per side)
5. Fix the side of the frame to the wall. Use packers at the fixing points to avoid distortion to the frame and to maintain the 5mm expansion gap. Do not over tighten the fixings!
6. On wider frames don’t forget to fix the top and bottom of the frames, this will help prevent deflection in windy conditions. Ensure that any holes drilled in the bottom of the frame are sealed with silicone to prevent moisture absorbing into the brick work
7. Using a chisel, break off the excess ends of the packers to create a neat finish.
8. Before reaching the final stages, clean any brick dust or debris from the frame and surrounding areas.
4. Installing the glazing
1. Commence glazing the frame, ensuring that appropriate glazing platforms are fitted around each aperture. These centralise the glass and allow free passage of water to run to the drainage slots.
2. Place each pane into position, noting that where opening casements are hinged from the sides they should have the glass packed at diagonally opposing corners to hold the casement square.
3. As each pane is positioned, the beading can be installed using a nylon mallet and tapped securely into place. It is recommended that horizontal beads are installed first and that the beads are refitted to their original position.
4. Make sure the area is clean and free from dust and debris. Measure and fit any internal trims that may be required. Trims maybe fitted using a suitable PVC-U adhesive or silicone.
5. Prior to sealing the frame to the internal wall, clean the frame and glass so it is free from dirt and grit. When using cleaning agents be sure to keep the room well ventilated.
6. Run a strip of masking tape around the frame, then apply a bead of sealant between the frame and the wall. Remove the tape before the sealant sets. Apply this step to all four sides of the frame.
7. Ensure that any trims are bonded to the frames to prevent dirt entering the joint.
8. Apply the end cap to the cill using a suitable adhesive.
5. Completing the Job
1. Clean the external surfaces to remove the dirt and grit.
2. Apply a strip of masking tape to the frame perimeter. Apply a smooth bead of silicone sealant between the frame and brick work. Before the sealant sets, remove the making tape to create a neat finish.
3. It is important to remember to seal the below the external cill.
4. Once the area has been cleaned of all debris, step back and admire your newly fitted Trade Uk window.