How to render around internal windows?

anna123

Good afternoon,

We have recently had new aluminium windows installed and needing to render around internally.

There are no architraves.

How do you suggest we move forward with the rendering?.

Can we render over the aluminium bit that is attached to the brick wall?.

Thickness of rendering.

Can we use ready made render?

If so, which do you recommend?

Also, should the blue board allign with existing brick wall?.

Thank you very much in advance.

Anna

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Comments

MitchellMc

Welcome to the Bunnings Workshop community @anna123. It's terrific to have you join us, and many thanks for your question about rendering.

When rendering around your new aluminium windows, it's best not to render directly over the aluminium section attached to the brick wall. Rendering over metal surfaces can cause adhesion issues and may lead to cracking over time. Instead, focus on rendering the brick or plasterboard surrounding the window while keeping the aluminium clear.

The thickness of the render typically ranges from 5 to 10mm, depending on the existing surface and the finish you're after. It’s important to apply it evenly and build up thin layers if needed, ensuring a smooth result.

You can certainly use a ready-made render mix, which is convenient and easy to work with. For internal rendering, a pre-mixed product like Dunlop Multipurpose Render would be ideal. Just follow the manufacturer's instructions for the best results.

As for the blueboard, it should ideally align flush with the brick wall to create a smooth, continuous surface for rendering. This helps ensure a professional, seamless finish without any awkward transitions between materials.

Here's a helpful step-by-step guide: How to render.

Please let me know if you have any questions.

Mitchell

anna123

https://www.workshop.bunnings.com.au/discussion/comment/43054#Comment_43054

Thank you so much for the prompt reply Mitchell.

We are very much beginner DIY so your advise is greatly appreciated.

I am unsure if you were able to see the photos that I attached of the installed windows?

What do you suggest that I do then if we cannot render over the aluminium?.

We are unable to add reveals now unfortunately as it will affect the lock or closing mechanism piece.

Anna

Jason

https://www.workshop.bunnings.com.au/discussion/comment/83645#Comment_83645

All community members can see your photos @anna123.

Please note there will be a delay before one of our resident Bunnings D.I.Y. experts can get back to you. Let me tag a couple of other community members for their thoughts: @Nailbag and @Dave-1.

Thanks for your patience in the meantime.

Jason

Nailbag

Hi @anna123

I would consider doubling up on the facing blue-board so the wall was continuous flat across the face. Then use an angled trim on the corner edge to increase strength and provide a straight edged line. And maybe something like a tile trim to finish the render up to the window reveal.

Nailbag

Screenshot 2024-10-08 at 8.57.31 PM.png

EricL

https://www.workshop.bunnings.com.au/discussion/comment/83645#Comment_83645

Hi @anna123

Those are excellent suggestions from @Nailbag. I totally agree with the suggestion of using the trims to get a uniform finish on the wall, I propose going to the store and examining the trims that you can use on your wall. Adding a second layer to the blueboard is a quick solution when you have uneven walls. The only other thing I can add to the recommendations made is to make sure that you have all the parts you need before you begin to render.

If you need further assistance, please let us know.

Eric

Dave-1

https://www.workshop.bunnings.com.au/discussion/comment/106769#Comment_106769

Good Morning @anna123

I like @Nailbag's suggestion tho not sure if the sill itself will work out with your locking mechanisim?

Any chance of a photo to show the window as a whole and also one of the sill and lock?

Dave

anna123

https://www.workshop.bunnings.com.au/discussion/comment/120586#Comment_120586

Thanks so much for your reply.

Yes, that is the tricky part.

I will try to upload another photo.

anna123

https://www.workshop.bunnings.com.au/discussion/comment/106769#Comment_106769

Thank you so much for your reply and suggestions.

anna123

https://www.workshop.bunnings.com.au/discussion/comment/43108#Comment_43108

Thank you so much for your suggestions and adding to the photo, that is super helpful.

The plan is actually to have plantation shutters installed as well.

Would a super thin trim be a good idea?.

If you zoom in on the screw they have used a plastic 'thing' have been used when putting the screw in. Perhaps we can remove that?.

I am worried that if we render, the window will rust?

Dave-1

https://www.workshop.bunnings.com.au/discussion/comment/83896#Comment_83896

Good afternoon @anna123

With the plantation shutters I would talk to the installer and ask what is needed. They may know already if they have been out to talk to you for a quote.

I would go with the trim @Nailbag has suggested. This is non structual tho and will not hold shutters in place. The Shutters will need to be fixed through to the brickwork/concrete on the sides.

The plastic thing is to act like a washer to hold the window in place. If you remove it and replace with a nicer screw and washer id say there is no problem but you need to have something there. (May be problematic removing and replacing)

As @MitchellMc has said and I agree that rendering over the aluminium of the frame is not a good idea due to bonding of the render to the aluminium.

Dave

anna123

https://www.workshop.bunnings.com.au/discussion/comment/106914#Comment_106914

Thank you, super helpful advise.

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