How to install a skylight

Jason
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How to install a skylight

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Project Overview

Installing a skylight is easy to do and an environmentally friendly way of bringing light into your home. You can improve the look and feel of any room, help cut your power bill and create an open feel in a closed space.
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Keep your plaster cut outs

If you need to cut a large hole in your ceiling to install a fan or a light, always keep the plaster. You can leave it up in the roof cavity next to the hole. That way, you’ll always have the perfect replacement piece if you need to fill the hole back in.

Step by Step Instructions

1 Choose a location on your roof for the skylight.
2 Preparing to install the skylight dome.
3 Cut the tile batten and surrounding tiles.
4 Installing the Mylar Tube and Dome.
5 Make sure the dome is waterproof using silicone
6 Mark up where you want to install the diffuser
7 Cut a hole in the ceiling for the skylight diffuser.
8 Screw the diffuser template into place
9 Secure the tubing and install the diffuser
  • Step 1. Choose a location on your roof for the skylight.

    Choose where you’d like to put the skylight on your roof.  Make sure it’s where it gets the most sun but because the Mylar tubing is long, it gives you the flexibility to choose which room your internal skylight will be in.
  • Step 2. Preparing to install the skylight dome.

    Place the skylight dome where you want it and work out how many tiles you need to remove. After removing the tiles, place the dome on your chosen spot and outline it, to mark the tiles that need cutting. 

  • Step 3. Cut the tile batten and surrounding tiles.

    You might also need to cut the batten so the dome sits flush to the roof. Mark where the batten needs cutting and use your handsaw to cut it. Wearing your safety glasses and earmuffs, cut the tiles to shape using a grinder with a diamond blade. Put the tiles you’ve cut back in place and put the dome over them, you may need to cut some surrounding tiles so the dome fits properly.
  • Step 4. Installing the Mylar Tube and Dome.

    Before installing the dome pull the Mylar tube over the back of it and use the silver tape to secure it.  Put the side marked ‘top’ closest to the top of the roof. Feed the Mylar tube into the roof space and put the skylight dome in place by tucking it under the surrounding tiles.

  • Step 5. Make sure the dome is waterproof using silicone

    Use silicone to waterproof under the side of the dome. Make sure you apply a fair amount of silicone under to prevent any leaks in the future. Now use a hammer to gently shape the flashing around the dome to match the roof’s profile. Then apply more silicone around the flashing to seal it.

  • Step 6. Mark up where you want to install the diffuser

    Before you can cut a hole in the ceiling, you need to know where the joists are. You can use a stud finder for this. The ideal place for the skylight diffuser is between these joists. Once you have selected your position, measure across the width of the ceiling and mark out a centre line.

  • Step 7. Cut a hole in the ceiling for the skylight diffuser.

    Use the diffuser as a template to mark out where you want the skylight to be. Then using your plaster saw, cut out the hole. Next, pull the Mylar tubing from the roof space, through the hole. Make sure it’s the right length. You may need to trim it if necessary.

  • Step 8. Screw the diffuser template into place

    Fit the diffuser into the hole, using a drill to fix it into the ceiling. Screw it all the way through, but you need to secure it into the plaster using the plastic tabs over the top of the screws. Tighten the screws further for a nice firm fit, then insert the screw caps.

  • Step 9. Secure the tubing and install the diffuser

    Pull the Mylar tubing down to the edge of the inside of the template. Now secure it in place using the silver tape. Run the tape around the inside edge of the template. Finally to install the diffuser, carefully bend it and fit inside the template.

Tools and Materials

Tools

  • Caulking gun
  • Drill
  • Earmuffs
  • Gloves
  • Grinder
  • Hammer
  • Handsaw
  • Knife
  • Pencil
  • Plaster saw
  • Power drill
  • Safety glasses
  • Tape measure

Materials

  • Silicone
  • Skylight kit
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Health & Safety

Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions that came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings Team Member.

Grave health hazards are linked to asbestos, which may be in homes built up to 1990. Health hazards may result from exposure to lead-based paints in older materials and copper chromium arsenic (CCA) treated timber. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page. You can also use a simple test kit from Bunnings to indicate the presence of lead-based paint.
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