Plastic conduit to concrete

[myeadurts]

Good afternoon everyone!
My head hurts cos my brother in law has a query and can't figure it out on his own!!!
Somehow this becomes MY problem, and so ultimately a discussion by you more knowledgeable people!!

Pointless question: Is plastic conduit in external stand alone pre cast concrete garage allowed to be secured to walls with gripfill/no more nails type substance (Other building adhesives ARE available!!) as drilling pre cast concrete tends to make it crack!
(He wants to tidy up wiring in garage, which means we'll probably be back on the forum asking a lot more questions later!)
Not installing anything or altering any mod so notification is not an issue!!
(IF Gripfill is not an option, HOW WOULD IT BE SUITABLE?)
Thanks in advance for any help! Hope this made someone chuckle!

 

[Chri5]

Baton the route out with wood and fix the conduit to the wood.

If the shell can't take fixings then the wood could be glued, although I absolutely hate using glue for anything- It's permanent and a pain when you don't want permanent.

 

[bernardgreen]

I have fixed conduit to pre-cast sectional concrete garage panels using saddles. It just requires a bit more care and patience

Determine where the thickest part of the concrete is by looking at the pattern if any on the outside and estimate how thickk it is if you cannot actually measure at the posts. Then drill slowly without hammer action ( often the concrete is soft enough to drill that way ) about half the thickness, if you hit a re-inforcing bar then abandon that hole and move up or down an inch. Fill the hole with mastic or something to protect the now exposed metal from rusting. Fill before fitting the conduit.

Rawlplug and screw the saddle to the wall. Since the fixing may not be very strong use more saddles than normal.

 

[ericmark]

Many many years ago the local council wanted to put safety barriers on a local bridge but there was a worry that drilling the concrete may have damaged the structure.

Lucky the excess concrete when building the bridge was used as a drive for council workshops.

So many firms were contacted and asked if they had a glue which could be used and 12 plates were glued to sample concrete in front of garage.

A ram was used between a wagon and test plates with a pressure gauge so each one could be compared and best glue selected.

First the engineer kicked the plates each one with post attached and 3 fell over then the others were tested and 5 very quickly failed and the remaining 4 all required quite some pressure before they failed.

How ever this pointed out not all glues even when supplied specially for the job work and between full failure and part failure you have a problem as the conduit is not held and you can't repair until you can fully remove.

I have often glued things because I could not use a drill but first test the glue. The use of silicon sealant is quite common as it will come off if required. But in a garage where oil and dust may have been adsorbed into the concrete you do need to test.

As already said the bigger surface area the better it is likely to stick and glueing wood to the wall then putting conduit on wood is a good idea. However wood and concrete expand at different rates and therefore multi short lengths work better than one long one.

But there can't be a answer as such as there are far too many variables. But in principle nothing wrong with glue. That is how the new seven bridge was built. Small bolts held sections together while glue dried but it is glue which holds it all together.

 

[Chri5]

Eric- I hope it's not water based glue

 

[ban-all-sheds]

Not installing anything or altering any mod so notification is not an issue!!

Sure?

Providing mechanical protection to an existing fixed installation is only not notifiable if the circuit protective measures and current carrying capacity of conductors are unaffected by the increased thermal insulation. (See Schedule 2B.)

Has your B-I-L done the calculations to show that this is the case?

 

[myeadurts]

The tension behind my eyeballs has somewhat dissipated!
I will inform BIL Gluing batons to wall is way forward and fix saddles to batons!
(I did wonder how fixing patress with glue would turn out!)
Will have work tested after by certified sparky who will issue cert if nec or advise etc!
Thanks again for all your help & advice!
Hope you all have a wonderful trouble free weekend!!!

 

[sparkwright]

are the concrete walls bolted together?

sometimes pre-fab garages already have pre-drilled holes in the walls, and they are connected with nuts and bolts via metal plate.

if this is the case may be you could use these fixings to also fix up some ply wood or some battens.

 

[Atilla]

Not installing anything or altering any mod so notification is not an issue!!

Sure?

Providing mechanical protection to an existing fixed installation is only not notifiable if the circuit protective measures and current carrying capacity of conductors are unaffected by the increased thermal insulation. (See Schedule 2B.)

Has your B-I-L done the calculations to show that this is the case?

perhaps you may care to give some "working" examples?

 

[RF Lighting]

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Ca Cg Ci Cc
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<edit>

For some reason the greater than or equals symbol doesn't work on code.

It should be where &gt; appears

 

[333rocky333]

We done work at Number one, london, where the damp proof rendering could not be drilled.
The sockets, etc were marked and The builders used some sort of adhesive to stick on square peices of wood.
This held the weight of galv conduit.

 

[Atilla]

Not installing anything or altering any mod so notification is not an issue!!

Sure?

Providing mechanical protection to an existing fixed installation is only not notifiable if the circuit protective measures and current carrying capacity of conductors are unaffected by the increased thermal insulation. (See Schedule 2B.)

Has your B-I-L done the calculations to show that this is the case?

its been a day - shall we assume not then?

 

[Atilla]

B-A-S .......................?

 

[RF Lighting]

Was my example not good enough for you?

 

[bernardgreen]

Advice from a man who knows a lot about concrete. ( he designs buildings using it in bulk ).

Glueing to concrete can work but it can also fail. The type of concrete and the type of glue have to be compatible to avoid concrete "cancer" being started by solvents in the glue. Some concrete has very low tensile strength and the surface layer can be easily separated from the mass of the concrete.