Regs/good practise on thickness of pipe lagging?

[WaterTight]

Haven't bought any for ages cos I inherited a tonne of it. Went to get some today and my merchant was offering four thicknesses for 15mm. I said it was going under floorboards on ground floor and so he recommended 19mm. I think they were 9mm, 13mm, 19mm and 25mm. What circumstances are these thickness for and are there regs on this?

 

[Billy Bob Bob]

the thicker the lagging the more protection from freezing there are regs covering external use it must be water proof as normal stuff will rot

 

[Puddle]

I thought the difference was thicker the lagging the bigger the profit for the merchant,coz every time I get the thick stuff they seem really happy charging me a fortune and when I say just thin ,cheap stuff will do ,they look all sad and loose interest in sale :icon9:

 

[Best]

Only regs I have heard is the insulation most be at least the thickness of the pipe, but usually only 19 mm is used by most people. If it's new build work then no excuse - it should be heavy, but if you are on 2nd hand work where pipes are too tight together, then 9mm might be best you can do. Pipes outside or unheated areas like a garage, are the important areas.

 

[kirkgas]

i have only seen different levels quoted in contracts we did for councils who quoted "lagging to protect to -??degree C" and then they specified what he had to use, but there must be something in a BS somewhere (i think BS6700 is a water reg)

 

[dontknowitall]

I always go for the thickest that will fit.

 

[WaterTight]

ooh err

 

[kirkgas]

I always go for the thickest that will fit.

so do your customers

 

[pobsdad]

Lagging?Wots dat den?

 

[tamz]

Should be 19mm min on 22mm pipe and 25mm thick on 15mm to offer the same level of protection. It is to do with the volume of water in the pipe.
Just because it is for sale doesn't mean you can legally use it but some is better than none i suppose.

 

[Best]

Should be 19mm min on 22mm pipe and 25mm thick on 15mm to offer the same level of protection. It is to do with the volume of water in the pipe.
Just because it is for sale doesn't mean you can legally use it but some is better than none i suppose.

Never heard that before, Tamz. I assumed volume of water didn't really matter.

 

[tamz]

As 15mm tube has less volume of water it also has less relative heat energy so will cool quicker.

 

[Best]

Thanks Tamz. Never thought of it that way. Suppose that's just the same as a thin film water freezing quicker in winter than a heavier amount.