100mm hole through wood....deep

Delvis · 29 Nov 2018 at 17:08

The need has arisedto cut a 100mm hole through some wood at our house, trouble is it's probably double that in depth!

A time have any pointers? We do have adiamoned core drill bit but it's somewhat useless on wood

Finners · 29 Nov 2018 at 17:17

How accessible is it? Can it be approached from both sides?

If it's something that can be moved and worked on at a bench or similar?

Not really got an idea but those questions might help the next person along

Delvis · 29 Nov 2018 at 17:22

Finners said:
How accessible is it? Can it be approached from both sides?

If it's something that can be moved and worked on at a bench or similar?

Not really got an idea but those questions might help the next person along

No, it's for an extraction fan - but it can be approached from both sides technically

So there's render one side (which the core drill will be great for) then pretty much just wood the other for some bizarre reason

Mercenary Keyboard Warrior · 29 Nov 2018 at 19:15

Holesaw with extension rod, you will have to chisel the middle out a few times

Delvis · 29 Nov 2018 at 19:27

Mercenary Keyboard Warrior said:
Holesaw with extension rod, you will have to chisel the middle out a few times

That's what I didnt want to do really

Purchased too much already!

Mercenary Keyboard Warrior · 29 Nov 2018 at 19:32

Delvis said:
That's what I didnt want to do really Purchased too much already!

Yeah sorry, but holesaw would be about £15. Could it be timber clad? you probably wouldnt need teh extension then if you can get access from each side as inside will be air or insulation.

Minstadave · 29 Nov 2018 at 19:35

Only way really to be honest is to use a hole saw/extension. Unless you drilled a tonne of smaller holes round the circumference and knocked out the centre.

JBuk · 29 Nov 2018 at 19:37

As already said - holesaw

Delvis · 29 Nov 2018 at 20:07

Yeah, we have a 102mm holesaw,. It the 100mm pipe doesn't fit through it ironically as 100mm is the internal size of the pipe!

Lesson learned I guess.

Sin_Chase · 29 Nov 2018 at 22:46

Are you sure it's all wood?

Have you put a single hole through the entire depth to confirm?

bremen1874 · 29 Nov 2018 at 22:51

Isn't a piece of wood of that size likely to be structural? Sticking a 4" hole through it might not be a good idea.

Delvis · 30 Nov 2018 at 07:58

Sin_Chase said:
Are you sure it's all wood?

Have you put a single hole through the entire depth to confirm?

Yep.

It's a couple of pieces at least

Delvis · 30 Nov 2018 at 07:59

bremen1874 said:
Isn't a piece of wood of that size likely to be structural? Sticking a 4" hole through it might not be a good idea.

From what I've been told it shouldn't be because of where it is, as the space where it's going is probably double that, if not more

Sin_Chase · 30 Nov 2018 at 08:08

Delvis said:
Yep.

It's a couple of pieces at least

If it's not one single piece of paper timber then using a hole saw shouldn't be too difficult?

DampDog · 30 Nov 2018 at 08:15

If it's 200mm or more thick I would imagine the first question would be "is it it OK to drill a hole that big through it?" For a timbers of that size it may well be weight bearing. Where is this 200mm thick piece of timber?

For joists, I thought the rule of thumb was not to notch more than a 1/8 of the width, or 1/2 if you drill on the centre of the width. (id check that)

Delvis · 30 Nov 2018 at 08:28

Sin_Chase said:
If it's not one single piece of paper timber then using a hole saw shouldn't be too difficult?

We wanted to go through in one go rather than cut a bit, chip it out, cut a bit, chip it out etc.

We've already pruchased loads of bits and bobs and in the run-up to Christmas it's adding up, so I came here for for answers

We may need to just coughup and buy the larger hole saw

DampDog said:
If it's 200mm or more thick I would imagine the first question would be "is it it OK to drill a hole that big through it?" For a timbers of that size it may well be weight bearing. Where is this 200mm thick piece of timber?

For joists, I thought the rule of thumb was not to notch more than a 1/8 of the width, or 1/2 if you drill on the centre of the width. (id check that)

It's more than one piece of timber.

It's above the external door from the kitchen on the side of the house. Essentially the kitchen needs an extractor fan put in to comply with building regulations.

Normally, we'd of expected a frame around the door, a gap of 20-30cm then the frame to the top floor, but this just appears to have multiple pieces of wood stuck in this gap.

Syla5 · 30 Nov 2018 at 08:43

Delvis said:
It's above the external door from the kitchen on the side of the house. Essentially the kitchen needs an extractor fan put in to comply with building regulations.

Are you just refitting a kitchen or is this part of a build that will be inspected by a building regs officer?

Delvis · 30 Nov 2018 at 09:06

Syla5 said:
Are you just refitting a kitchen or is this part of a build that will be inspected by a building regs officer?

The latter.

It's because of the building inspector it needs an extraction unit.

Syla5 · 30 Nov 2018 at 09:12

Find a better place for it just through masonry and use ducting to the extractor. Personally I wouldn't want to be exiting a building above a doorway anyway due to lintel and load stresses there anyway.

Delvis · 30 Nov 2018 at 09:20

Syla5 said:
Find a better place for it just through masonry and use ducting to the extractor. Personally I wouldn't want to be exiting a building above a doorway anyway due to lintel and load stresses there anyway.

No other option as the kitchen is in the 'middle' of the house (at the side)

Ducting is going to be used from the cooker hood to the wall,ducting through the wall.