How To Seal Bathroom Windows
Everything you need to know about how to seal bathroom windows is on this page, from how to clean, apply and what mastic to use when sealing bathroom windows.
Why Should I Seal Bathroom Windows?
When your bathroom windows are fitted there will be a small gap around the perimeter of the frame, if this small gap is left unsealed heat can escape the house and water can seep inside the house.
Windows are the barrier that stop the elements from coming into your home. If water manages to seep through the small gap between the window frame and wall water can stay underneath the frame for a long period of time causing rotting, flooding and a build up of mould that can be costly and hazardous to health. Heat can also escape through these small gaps which will great quite a high energy bill just to warm the house. Sealing these gaps with a mould resistant silicone sealant, a high quality decorators caulk can prevent all of the above.
​
Another reason to seal/reseal your bathroom windows is to make it stand out. Old sealant can start to lose its fresh look and can collect mould over time. You can remove old sealant and apply fresh high quality mould resistant sealant to spruce up your bathroom and give your windows a brand new look.
What Do You Seal Windows With?
To seal bathroom windows with silicone sealant or decorators caulk - you’ll need the following equipment:
-
Stanley knife
-
Caulking gun
-
Mould resistant high quality silicone sealant / or high quality decorators caulk
-
Silicone applicator tool
An alternative method, and therefore requiring different equipment, is to use a flexible caulking strip. This is a self-adhesive that can be cut to fit the gap between your bathroom windows and the wall.
Bathroom Window Frame Sealants
Listed across is a range of the Bathroom window frame sealants you can use to seal your bathroom windows, We offer these mould proof sanitary silicone sealants in our store, they come in a variety of colours and sizes to meet your needs.
Bathroom window frames compatible silicone sealants
What Areas Of Windows Do You Seal?
When sealing bathroom windows you want to make sure you seal all of the correct areas so there is no heat escaping and no water leakage.
​
Window Frame - When sealing the bathroom windows you want to seal the whole perimeter of the frame to the wall using mould resistant silicone or decorators caulk (so that you are able to paint beside the frame), this will stop water from leaking underneath the window frame and prevent any drafts. You are also going to want to seal the external perimeter from the outside with external sealant.
​
​
How To Seal Bathroom Windows
Step By Step
Once you’ve got your equipment and tools, it’s time to start sealing your bathroom windows.
Preparing the Silicone
Firstly you are going to want to find the correct mildew resistant silicone sealant or high quality caulk from a shop. There are many good brands out there to choose from, Dow Sil is a high quality brand you can use to find the correct mastic for your bathroom windows.
use your Stanley knife to cut the silicone sealant tube open. Before attaching the head or nozzle of the silicone, cut the tip as close to a 45-degree angle as possible, this will make applying it much easier and neater. Then place the silicone into the caulking gun and pull the trigger slowly until you feel a bit of resistant so that the tube is securely in the gun and will not fall out.
​
Clean the surface
You need to make sure that before applying the silicone that the surface has no dust, residue, water or old silicone if reapplying. You can wipe the surface down where silicone will be applied but you need to make sure it is then dried afterwards because silicone will not bond to a wet surface.
​
Apply the sealant
Get as close as possible to the edge of the area you want to seal, and then apply the silicone by pressing the caulking gun trigger. In a smooth movement, begin from one end and work you way to the other end. Do not touch the sealant once you have have applied until you have sealed the whole area. When finished Applying click the leaver on the back of the sealant gun to loosen the tube and stop sealant from oozing out the nozzle. Cover the end of the nozzle so no excess sealant spills on the floor.
​
Smoothing the sealant
Now spray the sealant you have applied with water (Water helps remover the excess sealant and stops it from sticking), then grab your sealant tool and attach the correct head onto it with the rounded radius you desire. Start from one end by putting the flat edge onto the wall and then gently pushing the tool up against the corner, then slowly glide along the sealant bead keeping one edge flat. As you pull the tool along it will be taking up excess sealant so have a paper towel ready so when the sealant builds up you can bring the tool away from the area and wipe off the excess sealant and start back where you left off until the perimeter of sealant is complete. Your windows should now be sealed properly. you may want to have a look over and run the tool over any bits and are a bit wider or need slight touching up. If there are gaps this is no problem you can re apply and start the process again in that small area.
Give the sealant 24 hours to cure do not run any water or disturb the sealant during this time. If you are doing your external windows make sure you have a backing rod in place before you start to seal around the frame perimeter.
Removing Old Bathroom Window Sealant
To remove old sealant you will need a Stanley Knife a small scraping tool, sealant remover and some sort of cloth.
Start by running the Stanley blade down the centre of the sealant, next scrape away as much sealant as you possibly can using the scraper (be carful not to damage the window frame or wall whilst doing this). Apply the sealant remover to the left over bits of sealant and leave it for 15 minutes.
Now you can rub over the sealant with a cloth and it should peel away quite easily.
The sealant removing process is a lot more time consuming than applying sealant. Once you have finished removing all sealant you can now clean down the area and re apply.