Enlarging skylight opening

[Nelsun2]

Hi all,
Just purchased a replacement skylight 400x400 but it does not fit in the original hole. Can someone tell me how to cut 6 to 8mm from the roof opening. Thanks in advance.

 

[Parksy]

Surely it would be much easier to return the 400mmx@400mm skylight to exchange it for one of the correct size?

 

[Nelsun2]

I don't think anyone makes a 395mm square skylight for my sized hole.

 

[jignc]

If the hole has had a wooden frame fitted round the hole (as it should have) then the wood must be thick enough to enable 3 to 4mm to be removed all the way round. Using a jigsaw with a long blade.
If you slide a metal ruler between the roof lining and the frame you may be able to feel when the wood ends and the insulation begins.

 

[WoodlandsCamper]

Post deleted - I made a suggestion that has already been discounted by the OP.

 

[Dustydog]

See this article by our Nigel Hutson
http://www.practicalcaravan.com/advice/34504-how-to-replace-a-pop-up-rooflight
You only need to remove 2.5mm from each edge.
Drill a suitable hole at the apex of each corner so the outer circumference is no more than + 2.5mm of the original
Stick some masking tape or similar on the roof surface and mark up.
As said earlier cut with a long but fine new blade in the jig saw.

Maybe you could post us some before and after pics

 

[Nelsun2]

Thank you for your prompt replies. I am going to jigsaw the hole from above as advised.

 

[Nelsun2]

Thanks for your advice.

 

[20170602yuanyuan]

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