OK to cut excess window fixing straps to help airtightness taping?

[Gaf]

Have seen these fixing straps referenced as often being a source of air leakage and reduced airtightness. Is there any reason I shouldn’t cut the strap after the affixing nails (red line) so there is less chance of them pulling up the airtight tape?

[Mr Punter]

One nail per strap looks a bit stingy.  Often see screws and plugs or masonry screws.  No issue with zipping off the surplus strap with a grinder and thin blade.

[Gaf]

56 minutes ago, Mr Punter said:

One nail per strap looks a bit stingy.  Often see screws and plugs or masonry screws.  No issue with zipping off the surplus strap with a grinder and thin blade.

Better to use screws on the last hole to both pin it flat and add extra strength to the strap? Throughout the house there’s at least one strap that has come loose.

[Mr Punter]

Yes, 50mm concrete screws are your friends here.  For a 7.5mm screw drill a 7mm hole and clear it out a bit so the screw goes in tight with an impact driver but does not lock up before it is home.