If you are installing a roof lantern or skylight it is important to understand how to complete it effectively so as to ensure the inside of your property stays dry. Incorrectly installed skylights can cause future problems for your property. Installing skylight flashing will go a long way to ensuring your skylight stays bright, effective and dry for the long-term.
Skylight flashing is designed to keep as much of the moisture on the surface, instead of finding its way around the sides of the skylight application and slowly entering through the gaps. Here we take a look at how you can effectively add skylight flashing in a DIY fashion, though we would always advise that you hire the services of a professional skylight installation team to ensure a solid and professional job when first installing your skylight, rather than waiting for a later date to install the flashing.
If you need to replace shingle from around your skylight pay attention to the old flashing around your skylight. You’ll notice that it is most likely sitting on a raised curb. This is made with metal flashing, making it watertight. You should be able to reuse this if it is carefully removed, otherwise, new flashing will have to be bought directly from the skylight manufacturer or the roofing company you choose to work with on this project.
Remove the Current Flashing Carefully – The first port of call is to remove the counter-flashing present on the skylight. You will either have to remove the entire glass frame or just unscrew the metal from the raised curb. This will depend on the type of skylight you have in place. Remove the old, dry shingle or materials that you are looking to replace and carefully remove nails to save the flashing.
Underlay Application – You need to add a layer of protection underneath the metal flashing as a safety net. This underlayment can be applied as self-sticking and will help to direct any water that might possibly get through the metal flashing away from the skylight, and towards the roof. Overlap each new piece onto the lower part, installing from the bottom of the skylight up.
Lower Flashing – Once you have applied the course of the shingle you are applying to the roof, set the bottom one-piece flashing on top of this. Be careful to only nail it at the upper corners and not directly into the roof.
Step-Flashing Application – As you install each shingle course continue to nail the step flashing at the upper corner, the same as with the first lower flashing. You can then begin to weave the flashing along the side of the metal flashing as you work your way up.
Top Flashing – The top part of the flashing will wrap around the sides as well as the top of the skylight. Once fitted the next row of shingle should be applied, leaving a small portion of the flashing exposed.
The metal pieces that make up the flashing don’t have to necessarily seal together to be effective. Water will run downhill, to you only need to install the flashing in the right order to allow this to happen without any moisture entering the interior of the skylight. Looking after your roof and skylight is important to maintain the integrity and aesthetic of your property.
We would always advise that you utilise the experience of a professional skylight company to assist you in installing a skylight effectively, and prepare with secure flashing to prevent future problems.