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Knock a hole in A Sub-Floor Wall?

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dodger421

dodger421

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A very daft question from someone who doesn’t crawl around under houses for a living.

Our shower pump has failed and needs replacing, it’s buried underneath the floor and rather than lifting Lino/plywood and/or laminate flooring I’ve lifted the carpet in the spare room and cut a hatch in the floor intending to crawl along to the shower pump.

There’s a short brick wall running the length of the house with no access holes in it (pictured) and which stops me getting to the location of the pump. Can I knock some bricks out to make an access hole between two joists or is that verboten?
 

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littlespark said:
Normally there’s a deliberate route through from one section to another. Must be another hatch somewhere in the floor.

surprised to see those walls without cables and pipes running through the gaps between the bricks.
Click to expand...

I would imagine there are multiple hatches in the house, but everywhere else is either Lino-on-plywood, Vinyl tiles-on-plywood or laminate. Lifting the carpet and crawling through from the spare room seemed like it would involve the least disruption/making good after.

There are four walls like those pictured running lengthways, and about 3/4’s of the way down the house another solid wall running front to back. There doesn’t seem to be a hole through that one (yet). I’ve had a camera in through a hole under a kitchen cabinet before and I think are some holes in the lengthways walls on the other side, but none on the side I’m on.
 
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The picture brings back memories as me as a skinny 16 year old apprentice getting under the floors...

I could fit in that space with only 2 rows of bricks... just couldnt breath out unless my chest was between joists
 
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The honeycomb walls are for ventilation of the suspended floor space to prevent rot, there should also be air bricks in the outside walls on both sides to provide through ventilation, the underside of the floor was never meant to be accessible, but sometimes hatch's where provided if electrical cable's where run in the underfloor space, but very rare in that age of building, only when modern electricians got involved did floors get butchered, electrics where in conduit from drops from the ceiling.
 
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