How to Corretly Install Roof Hatches

Having a roof hatch installed on your home or business can allow for increased access to otherwise inaccessible locations. By choosing the right location and type of roof hatch you can gain the most from the application and – with some out of the box thinking and planning – expand on the amount of habitable space in your place.

Roof Hatch Installation Guide

Thanks to innovations in technology and construction it is now easier than it has even been to install a roof hatch in your home or business. Modern roof hatches are lightweight, durable and watertight, meaning less stress for you and the rest of your structure. In some cases they can even be seamlessly inserted into a pre-cut space in the roof.

While all of this makes the process sound simple, it is still important to follow your installation guide and any additional instructions.

Preparation for Installation

Once you have selected a location that is clear of any internal electrical, gas, or water systems carefully remove all tiles or concrete from the area. Ensure that the gap accounts for both the external and internal measurements of the hatch. Do not cut through any structural or load-bearing beams during the creation of the opening. Predrill holes into the selected beams that the hatch will be secured to. Remove any tiles surrounding the opening to allow for easier installation.

  1. Installation onto a Steel or Timber-Framed Roof

Once the opening has made, place the hatch evenly over the opening. You can then line up the predrilled holes with the corresponding holes on the hatch, securing the unit with timber-specific screws.

After securing the hatch to the roof replace all roofing materials around the hatch up to 10mm from the exterior walls of the hatch. Depending on the specific rules of installation in your state a certain amount of flashing (weatherproofing) is required. A bead of silicon is to be applied along and under all sides of the hatch as well as under the hatch’s overhang. Weatherproof metal cladding is also required for complete flashing coverage and protection.

  1. Installation onto a Concrete Roof

Place the hatch correctly over the fully-measured opening. Due to the difficulty of drilling into concrete the hatch is to be secured onto the roof using a layer of bitumen or similar roofing material around the exterior of the hatch.

For weatherproofing, install a 12mm section of plywood on all sides of the hatch. Then apply a 7mm torch membrane directly to the plywood. At the base of the torch membrane a 45mm x 45mm angle fillet is to be left empty.

If your roof does not have any insulation installed then this process is slightly altered. Between the exterior of the hatch and the torch membrane, 20mm of insulation is to be placed on all sides of the hatch. The thickness of the plywood should then be increased to 9mm to assist in insulation.

If you’re looking for a quality roof hatch to make your installation easier, talk to our team today. Call 08 9434 5611 to talk to our roofing supplies experts in Perth.