I want to fasten a couple of wooden fence posts, about 1.5 m high, with a
fence panel fastened between the posts, on top of a brick wall that is
capped with stone slabs. The brick wall appears to be made of two bricks
laid side by side - I can't be certain without removing a cap-stone, and
they are firmly mortared in place. However the width of the slabs is 270 mm,
which suggests two courses of brick side by side. The slabs are 25 mm thick.

Sketch: https://i.postimg.cc/cJd877jn/fence-posts.png

The main problem will be the amount of sideways leverage that there would be
on the posts if a wind like Storm Ciara/Dennis blows on the panel.

I have seen mounting brackets such as
https://www.diy.com/departments/bloo...1628475_BQ.prd
which have four holes.

What is the best way of drilling through a stone slab without it cracking? I
presume the best way to anchor the bolts is to use expanding metal bolts. Is
it best to try to make the fixing expand into the brick, and not also to
expand into the stone for fear of cracking it.

It would be possible to drill a couple of holes horizontally through the
wooden post, sideways into ends of bricks that make up piers at the end of
the wall, to provide additional fixing for the posts, though these bolts
would only be 1 brick above the level of the slabs.

NY wrote:
I want to fasten a couple of wooden fence posts, about 1.5 m high, with a
fence panel fastened between the posts, on top of a brick wall that is
capped with stone slabs. The brick wall appears to be made of two bricks
laid side by side - I can't be certain without removing a cap-stone, and
they are firmly mortared in place. However the width of the slabs is 270 mm,
which suggests two courses of brick side by side. The slabs are 25 mm thick.

Sketch: https://i.postimg.cc/cJd877jn/fence-posts.png

The main problem will be the amount of sideways leverage that there would be
on the posts if a wind like Storm Ciara/Dennis blows on the panel.

I have seen mounting brackets such as
https://www.diy.com/departments/bloo...1628475_BQ.prd
which have four holes.

What is the best way of drilling through a stone slab without it cracking? I
presume the best way to anchor the bolts is to use expanding metal bolts. Is
it best to try to make the fixing expand into the brick, and not also to
expand into the stone for fear of cracking it.

It would be possible to drill a couple of holes horizontally through the
wooden post, sideways into ends of bricks that make up piers at the end of
the wall, to provide additional fixing for the posts, though these bolts
would only be 1 brick above the level of the slabs.



Attaching a big sail to the top of a brick wall sounds to me like a good
way of breaking the wall. Mortar really isnt that strong in tension!

It would be better to plant two long 4x4€� poles behind the wall and then
maybe use another bit of 4x4 fixed to the face of the poles to bring the
fence line €œforward€� to where you want it.

Tim

--
Please don't feed the trolls

NY wrote

I want to fasten a couple of wooden fence posts, about 1.5 m high, with a
fence panel fastened between the posts, on top of a brick wall that is
capped with stone slabs.

I wouldn’t do it myself. Brick walls arent that strong
to sideways forces on the fence on top of the wall.

I'd have steel poles in the ground with the fence
bolted to those above the height of the brick wall.
That would look fine with the fence on the wall side
of the steel poles up against the brick wall with
some form of spacer if necessary for appearance.

The brick wall appears to be made of two bricks laid side by side - I
can't be certain without removing a cap-stone, and they are firmly
mortared in place. However the width of the slabs is 270 mm, which
suggests two courses of brick side by side. The slabs are 25 mm thick.

Sketch: https://i.postimg.cc/cJd877jn/fence-posts.png

The main problem will be the amount of sideways leverage that there would
be on the posts if a wind like Storm Ciara/Dennis blows on the panel.

I have seen mounting brackets such as
https://www.diy.com/departments/bloo...1628475_BQ.prd
which have four holes.

What is the best way of drilling through a stone slab without it cracking?
I presume the best way to anchor the bolts is to use expanding metal
bolts. Is it best to try to make the fixing expand into the brick, and not
also to expand into the stone for fear of cracking it.

It would be possible to drill a couple of holes horizontally through the
wooden post, sideways into ends of bricks that make up piers at the end of
the wall, to provide additional fixing for the posts, though these bolts
would only be 1 brick above the level of the slabs.

On 17/02/2020 15:21, Tim+ wrote:
NY wrote:
I want to fasten a couple of wooden fence posts, about 1.5 m high, with a
fence panel fastened between the posts, on top of a brick wall that is
capped with stone slabs. The brick wall appears to be made of two bricks
laid side by side - I can't be certain without removing a cap-stone, and
they are firmly mortared in place. However the width of the slabs is 270 mm,
which suggests two courses of brick side by side. The slabs are 25 mm thick.

Sketch: https://i.postimg.cc/cJd877jn/fence-posts.png

The main problem will be the amount of sideways leverage that there would be
on the posts if a wind like Storm Ciara/Dennis blows on the panel.

I have seen mounting brackets such as
https://www.diy.com/departments/bloo...1628475_BQ.prd
which have four holes.

What is the best way of drilling through a stone slab without it cracking? I
presume the best way to anchor the bolts is to use expanding metal bolts. Is
it best to try to make the fixing expand into the brick, and not also to
expand into the stone for fear of cracking it.

It would be possible to drill a couple of holes horizontally through the
wooden post, sideways into ends of bricks that make up piers at the end of
the wall, to provide additional fixing for the posts, though these bolts
would only be 1 brick above the level of the slabs.



Attaching a big sail to the top of a brick wall sounds to me like a good
way of breaking the wall. Mortar really isnt that strong in tension!

It would be better to plant two long 4x4€� poles behind the wall and then
maybe use another bit of 4x4 fixed to the face of the poles to bring the
fence line €œforward€� to where you want it.

Tim

Agreed. With the caveat that the OP does not say how high the brick wall
is (the drawing suggests about six courses). If it really is a small
dwarf wall, maybe 18 inches high, then how about drilling a couple of 3
inch holes right down through the capstones and the wall and through the
wall footings (assuming it has footings), and setting in place a couple
of scaffold poles, ideally hammered down to a couple of feet below
ground level. The visible parts of the poles could be concealed with a
couple of lengths of 4x2, sandwiching the fence panel in position.

On 17/02/20 15:21, Tim+ wrote:
NY wrote:
I want to fasten a couple of wooden fence posts, about 1.5 m high, with a
fence panel fastened between the posts, on top of a brick wall that is
capped with stone slabs. The brick wall appears to be made of two bricks
laid side by side - I can't be certain without removing a cap-stone, and
they are firmly mortared in place. However the width of the slabs is 270 mm,
which suggests two courses of brick side by side. The slabs are 25 mm thick.

Sketch: https://i.postimg.cc/cJd877jn/fence-posts.png

The main problem will be the amount of sideways leverage that there would be
on the posts if a wind like Storm Ciara/Dennis blows on the panel.

I have seen mounting brackets such as
https://www.diy.com/departments/bloo...1628475_BQ.prd
which have four holes.

What is the best way of drilling through a stone slab without it cracking? I
presume the best way to anchor the bolts is to use expanding metal bolts. Is
it best to try to make the fixing expand into the brick, and not also to
expand into the stone for fear of cracking it.

It would be possible to drill a couple of holes horizontally through the
wooden post, sideways into ends of bricks that make up piers at the end of
the wall, to provide additional fixing for the posts, though these bolts
would only be 1 brick above the level of the slabs.



Attaching a big sail to the top of a brick wall sounds to me like a good
way of breaking the wall. Mortar really isnt that strong in tension!

That's what I would have thought, but I happened to be walking round a
new estate being build near here a few days after "Ciara" to see if
there had been any damage to fences. There wasn't, surprisingly enough,
but as much of the estate is on slopes, I was amazed at the number of 2m
fences on top of brick walls ranging from 50 - 150 cm in height. The
fence posts were taken down 30 - 50 cm or so below the top of the wall
and screwed into the side of it.

--

Jeff

"newshound" wrote in message
news
On 17/02/2020 15:21, Tim+ wrote:
NY wrote:
I want to fasten a couple of wooden fence posts, about 1.5 m high, with
a
fence panel fastened between the posts, on top of a brick wall that is
capped with stone slabs. The brick wall appears to be made of two bricks
laid side by side - I can't be certain without removing a cap-stone, and
they are firmly mortared in place. However the width of the slabs is 270
mm,
which suggests two courses of brick side by side. The slabs are 25 mm
thick.

Sketch: https://i.postimg.cc/cJd877jn/fence-posts.png

The main problem will be the amount of sideways leverage that there
would be
on the posts if a wind like Storm Ciara/Dennis blows on the panel.

I have seen mounting brackets such as
https://www.diy.com/departments/bloo...1628475_BQ.prd
which have four holes.

What is the best way of drilling through a stone slab without it
cracking? I
presume the best way to anchor the bolts is to use expanding metal
bolts. Is
it best to try to make the fixing expand into the brick, and not also to
expand into the stone for fear of cracking it.

It would be possible to drill a couple of holes horizontally through the
wooden post, sideways into ends of bricks that make up piers at the end
of
the wall, to provide additional fixing for the posts, though these bolts
would only be 1 brick above the level of the slabs.



Attaching a big sail to the top of a brick wall sounds to me like a good
way of breaking the wall. Mortar really isnt that strong in tension!

It would be better to plant two long 4x4€� poles behind the wall and then
maybe use another bit of 4x4 fixed to the face of the poles to bring the
fence line €œforward€� to where you want it.

Tim

Agreed. With the caveat that the OP does not say how high the brick wall
is (the drawing suggests about six courses). If it really is a small dwarf
wall, maybe 18 inches high, then how about drilling a couple of 3 inch
holes right down through the capstones and the wall and through the wall
footings (assuming it has footings), and setting in place a couple of
scaffold poles, ideally hammered down to a couple of feet below ground
level. The visible parts of the poles could be concealed with a couple of
lengths of 4x2, sandwiching the fence panel in position.

Wouldnt like to try doing that without damaging the wall myself.

On Tue, 18 Feb 2020 03:40:10 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH senile troll****

03:40 already??? LOL Just what the **** is wrong with you senile idiot?

--
dennis@home to retarded senile Rot:
"sod off rod you don't have a clue about anything."
Message-ID:

On Tue, 18 Feb 2020 02:45:46 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH troll****

02:45 already??? LOL Let me guess, senile cretin: first thing you do when
you get out of bed is switch on the computer, log in on Usenet and then
start with your trolling until you forget that you got NOBODY in RL to talk
to (for the known reasons)!

--
Norman Wells addressing trolling senile Rodent:
"Ah, the voice of scum speaks."
MID:

On Monday, 17 February 2020 14:47:30 UTC, NY wrote:

I want to fasten a couple of wooden fence posts, about 1.5 m high, with a
fence panel fastened between the posts, on top of a brick wall that is

that is a classic no-no. Cement mortar has low tensile strength which over time normally falls to zero.

capped with stone slabs. The brick wall appears to be made of two bricks
laid side by side - I can't be certain without removing a cap-stone, and
they are firmly mortared in place. However the width of the slabs is 270 mm,
which suggests two courses of brick side by side. The slabs are 25 mm thick.

Sketch: https://i.postimg.cc/cJd877jn/fence-posts.png

The main problem will be the amount of sideways leverage that there would be
on the posts if a wind like Storm Ciara/Dennis blows on the panel.

I have seen mounting brackets such as
https://www.diy.com/departments/bloo...1628475_BQ.prd
which have four holes.

What is the best way of drilling through a stone slab without it cracking? I
presume the best way to anchor the bolts is to use expanding metal bolts. Is
it best to try to make the fixing expand into the brick, and not also to
expand into the stone for fear of cracking it.

It would be possible to drill a couple of holes horizontally through the
wooden post, sideways into ends of bricks that make up piers at the end of
the wall, to provide additional fixing for the posts, though these bolts
would only be 1 brick above the level of the slabs.

think again


NT