What is the depth of a standard cavity in a cavity wall.

[garrymum]

Hi guys

I am trying to measure where I can drill from the loft so that I can feed a co-ax cable down the space between the plasterboard and the blockwork. I have a reference point in the loft as the coax from the outside aerial enters the loft from the gable end.

I know the bricks are 100mm deep. What I need to know is what depth is the cavity and the blockwork. If I can find the total measurement of bricks + cavity + blockwork, I can roughly get a distance from the total width to where the aerial cable enters the house on the outside. Then when in the loft, I can measure back from the cable entry. This hopefully will give me a point to drill. Hoping to then feed a coax cable down the hole between the plasterboard and the blockwork.

I had a look in the loft and the plasterboard ceiling butts up to a header plate (approx 4" wide). Will this be somewhere close to the point I need to drill?

I am trying to cause as little damage as possible to the bedroom.

Any suggestions?

Thanks.

[stuart45]

How old is your house?

[garrymum]

stuart45 wrote:

How old is your house?

Sorry, I was gong to add that but forgot after all my typing.

It was built in 2001. Brick built detached, think it was built by McAlpine.

[stuart45]

Chances are that the cavity is 100mm, and internal block 100mm. This is not definite though. You could measure the thickness at the reveals.

[garrymum]

stuart45 wrote:

Chances are that the cavity is 100mm, and internal block 100mm. This is not definite though. You could measure the thickness at the reveals.

Thanks Stuart.
I always have to find the most difficult route at times!