Measuring replacement corrugated roof sheet

[amfisted]

Afternoon all

I have a 1960s concrete sectional garage with an asbestos roof consisting of corrugated sheets. I intend to have the roof replaced as soon as I can afford it. At some point in the past a previous occupier has replaced one of the asbestos sheets with a section of clear corrugated plastic, presumably due to breakage. For reasons of security I’d like to replace that plastic sheet with a galvanised alternative till I can afford to have the whole roof done, and my question is, do these sheets come in a standard channel width, or are there alternatives, and do I need to measure the channel before ordering?

I know I’ll need to measure the overall length and width of the sheet required- it’s just the channel width I’m querying because they’ll have to interlock with the sheets either side.

Thanks in advance

 

[noseall]

Afternoon all

I have a 1960s concrete sectional garage with an asbestos roof consisting of corrugated sheets. I intend to have the roof replaced as soon as I can afford it. At some point in the past a previous occupier has replaced one of the asbestos sheets with a section of clear corrugated plastic, presumably due to breakage. For reasons of security I’d like to replace that plastic sheet with a galvanised alternative till I can afford to have the whole roof done, and my question is, do these sheets come in a standard channel width, or are there alternatives, and do I need to measure the channel before ordering?

I know I’ll need to measure the overall length and width of the sheet required- it’s just the channel width I’m querying because they’ll have to interlock with the sheets either side.

Thanks in advance

The corrugations are standardised.

 

[amfisted]

The corrugations are standardised.

Many thanks

 

[Deluks]

They aren't quite quite all the same, if you walk into B&Q and pick up a sheet of corrugated roofing, you might end up with the smaller profile size. 3"asb is probably the one you require.
There is a bigger size but that was probably just for factory roofs and farm buildings.

I don't see the need to replace it for security. The plastic sheets are tough and hard to break, you can do it but it makes a lot of noise. No one would bother, especially if you put a few deterrent signs up (fragile roof, contains asbestos etc.)
If you don't want people peering in just paint them internally with an oil based primer or paint.

The shed might have originally been supplied with a couple of clear sheets. Your plastic one might be original, if it is deteriorated then obviously yes replace it.

Galvanised is an option, but you can get fibre cement replacement sheets to match the asbestos ones. They look the same just without the asbestos content.

 

[amfisted]

They aren't quite quite all the same, if you walk into B&Q and pick up a sheet of corrugated roofing, you might end up with the smaller profile size. 3"asb is probably the one you require.
There is a bigger size but that was probably just for factory roofs and farm buildings.

I don't see the need to replace it for security. The plastic sheets are tough and hard to break, you can do it but it makes a lot of noise. No one would bother, especially if you put a few deterrent signs up (fragile roof, contains asbestos etc.)
If you don't want people peering in just paint them internally with an oil based primer or paint.

The shed might have originally been supplied with a couple of clear sheets. Your plastic one might be original, if it is deteriorated then obviously yes replace it.

Galvanised is an option, but you can get fibre cement replacement sheets to match the asbestos ones. They look the same just without the asbestos content.

Thanks for that.

I would prefer to replace the plastic sheet, though as I said in my OP it would be no more than a stopgap till I can have the whole roof done. It does serve one useful purpose, which is to let light into a space which is otherwise dark when the doors are closed.

I'll consider my options, and thanks once more.