Replacing windows – step by step

Remove the old window

01 Start by removing the window lining both inside and outside. Sawing off nails or frame screws between frame and wall. Loosen the wedges and lift out the frame. Check that the opening in the wall is about 20 mm larger than the outer dimensions of the frame on the new windows.

Tip! By sawing in the frame and taking it out in pieces, you minimize the risk of damaging the window sash. Clean the window opening and check that the wood in the wall is healthy. If necessary, replace rotten wood.

Install the new window

02 If the construction of the window makes it possible to lift the window frame out of the frame, start with this step. The assembly will then be easier. Then place spacer wedges where the bottom piece of the frame should rest. The wedges must meet each other, one from the outside and one from the inside. Attach boards or similar to the outside of the hole to support the window from falling out during the assembly process. Place the window on the wedges.

03 Then wedge in the corners of the frame top and side pieces from the outside and inside. The wedges must not cover the pre-drilled holes for the frame screw. The wedges must be pressed in so hard that the window is temporarily stuck in the opening. Do not hit the wedges too hard so that the frame curves. Weigh the frame with a spirit level. Also check that the frame is plumb and does not tilt inwards or outwards. Measure diagonally from corner to corner on both sides. The two diagonal dimensions must be identical.

04 When the diagonal dimensions are equal and the frame is plumb, it is time to screw in the frame screws. Then remove the wedges at the side pieces of the frame, but leave the wedges under the bottom piece of the frame. Weigh the spirit level again. If the frame needs to be adjusted, do this with the help of the frame screws. Hang on the window frame (in cases where the window frame can be hung from the frame) and check that the window is easy to open and close. Finally, readjust if necessary using the frame screws.

05 Then it’s time to seal with window gears. Drive the space between the window frame and the wall from the inside. Do not pack too tightly, there should be an air pocket between the strip and the outer lining.

06 Once the drive material is in place, cover the inside with a bottom strip and a diffusion-tight soft joint. The seal on the outside should be windproof but not diffusion-tight – it should “breathe”. (If joint foam is used, check that the side pieces do not bend inwards and that it is possible to readjust). Finish by lubricating the hinges and espagnolette. once the drive material is in place, cover the inside with a bottom strip and a diffusion-tight soft joint. The seal on the outside should be windproof but not diffusion-tight – it should “breathe”. (If joint foam is used, check that the side pieces do not bend inwards and that it is possible to readjust). Finish by lubricating the hinges and espagnolette.

Install window panes

07 After the window has been mounted, the window panes must be attached. If you keep the old window panes during renovation, first seal with building silicone or similar. The window frame may have milled grooves for the window panes. Measure the so-called free dimension where the sheet metal should sit and add 20mm to get the correct sheet metal length.

08 Slant saw or then cut a recess in the front and rear edge of the tin according to Figures 1 and 2. Then fold up an approximately 10mm high end at both ends, and fold in the rear edge according to Figures 3 and 4. The bend prevents the rainwater from flowing out on the sides. Then saw out two grooves from the outer linings to make room for the window panes.

Make sure that the grooves keep the same slope as your window pane. Put the tin in place (and push into a possible tin groove in the frame). Then fasten the plate with a screw. Do not forget to inspect and possibly replace the overview above the window.

if you wanna read about which windows best suits your house.

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