I need help interpreting this engineering plan

pieroabcd

Hi,
I want to hang a couple of shelves on the kitchen extention wall to hold the 50 inch tv (14kg) and some lightweight appliances, but I'm a bit confused about the places to drill.

Knocking with a finger on the internal walls I can hear an alternation of full and hollow sounds, so I suspect that there's a wood frame behind the plaster. A big and heavy radiator is hanging on one of the walls. Knocking on the vertical of two of the hangers the sound is full, while on the vertical of another one the sound is hollow.

I've found this plan dating back to 2014.
One of the notes ot the top reads
cavity wall:
block 0.60
insulation 0.20
bricks 2.20

This is the plan that it includes.



I don't understand what's the structure of the walls.
The innermost one shows a ripple, the middle one is blank (is it the empty space / cavity?) and the external one shows another symbol like a //.
Can someone explain what's the meaning of those symbols, please?

Do I have to follow the full sounds to drill the holes or are the innermost walls made of bricks too?
Is it safe to drill on the vertical of the radiator hangers or would I risk overloading the structure?

Did I ever mention how little love (-inf) I feel for timberframes? :-)

Thanks.

MikeJXE

The walls either end of the kitchen are solid brick (no cavity)

The walls surrounding the other room are, internal block external brick with cavity between 

Just because you hear solid and hollow sounds doesn’t mean it a hollow stud wall, you could be tapping between plasterboards dabs. (Adhesive to stick plasterboard to the blocks)

What makes you think it’s timber frame ? 

If you are fixing the tv bracket on a brick/block wall use 100mm frame fixers (Wicks) if on studded wall try to fix the the studding  uprights with 75mm screws 

Test drill behind where the tv is going  with 3mm bit to find out if it's hollow or not

Be careful not to hit pipes/cables 

pieroabcd

By block you mean bricks made of concrete like this? 


or maybe hollow like this?



I suspected a timber frame because of the hollow sound, but it's nice to know that it can be due to the plasterboard dabs.

I've ordered one of those tools to find metal/pipes/studs to make sure i don't hit anything sensitive.

Thanks!

MikeJXE

Not the hollow one 

Cables for switches or sockets normally are vertical to the ceiling 

Pipes would be to radiators in copper or plastic 

Don’t rely solely on the stud finder tool look logically 

TELLIT01

Although the wall construction is block and brick most walls these days seems to be finished off internally with plasterboard rather than by plastering the walls.  Cheaper and easier for the builder but a potential pain in the wotsit if you later want to put anything on the wall.