Shortly after the Christmas pud has settled down I'll be starting work on my
new garage. The flank wall is 'half brick' with pillars ie approx 100mm
thick. Due to its length (7 metre) it needs an expansion joint. I understand
that the conventional wisdom is to tie the two bit of wall together with
normal cavity wall ties 'along the length' of the wall, with one side
wrapped in a bit of dpc to let it slide.

But what is used as the 'spacer' between the two bit of 'end to end' wall?
(ok I know it needs sealing with a flexible mastic but what is the filling
in the sandwich ?)

Andrew Mawson

"Andrew Mawson" wrote in message
...
Shortly after the Christmas pud has settled down I'll be starting work on my
new garage. The flank wall is 'half brick' with pillars ie approx 100mm
thick. Due to its length (7 metre) it needs an expansion joint. I understand
that the conventional wisdom is to tie the two bit of wall together with
normal cavity wall ties 'along the length' of the wall, with one side
wrapped in a bit of dpc to let it slide.

But what is used as the 'spacer' between the two bit of 'end to end' wall?
(ok I know it needs sealing with a flexible mastic but what is the filling
in the sandwich ?)


Flexcell - it's a bitumen impregnated soft board.
http://www.sundeala.co.uk/flexcell.htm

"Andrew Mawson" wrote in message
...
Shortly after the Christmas pud has settled down I'll be starting work on
my
new garage. The flank wall is 'half brick' with pillars ie approx 100mm
thick. Due to its length (7 metre) it needs an expansion joint. I
understand
that the conventional wisdom is to tie the two bit of wall together with
normal cavity wall ties 'along the length' of the wall, with one side
wrapped in a bit of dpc to let it slide.

My builders used a metal strip that screwed to the existing wall. That had a
matching piece, with protruding ties, that was built into the new wall.
Apparently, the two parts have some movement relative to each other, but
they still hold the walls together against gross movements.

Colin Bignell

"nightjar .uk.com" nightjar@insert_my_surname_here wrote in message
. ..

"Andrew Mawson" wrote in message
...
Shortly after the Christmas pud has settled down I'll be starting work
on
my
new garage. The flank wall is 'half brick' with pillars ie approx 100mm
thick. Due to its length (7 metre) it needs an expansion joint. I
understand
that the conventional wisdom is to tie the two bit of wall together with
normal cavity wall ties 'along the length' of the wall, with one side
wrapped in a bit of dpc to let it slide.

My builders used a metal strip that screwed to the existing wall. That had
a
matching piece, with protruding ties, that was built into the new wall.
Apparently, the two parts have some movement relative to each other, but
they still hold the walls together against gross movements.

Colin Bignell



Colin thanks for your reply.

That is the wall starter tie kit that allows up and down movement yet holds
the new brickwork to an exisitng wall - I'm using those tying the new walls
to the house, but it's not quite the question that I asked !.

What I'm trying to find out is what is used as the spacer in lateral
expansion joints in long walls whilst they are being built. The two sections
of wall butt close together end to end, are prevented from moving sidewise
by normal wall ties fully bedded in a mortar joint on one wall section, but
wrapped in dpc in the other wall section to allow it to slide along the
length of the wall. Finally the joint is mastic filled to make it
weatherproof, but during building 'something' is used to ensure an 8mm gap
in the mortar.

Logically it has to be firm enough to keep the mortar out while setting the
bricks, but able to be squashed as the wall length changes with expansion.

If I cannot find what is 'proper' I intend to use slices of expanded
polystyrene.

Andrew Mawson

Andrew Mawson wrote

What I'm trying to find out is what is used as the spacer in lateral
expansion joints in long walls whilst they are being built. The two sections
of wall butt close together end to end, are prevented from moving sidewise
by normal wall ties fully bedded in a mortar joint on one wall section, but
wrapped in dpc in the other wall section to allow it to slide along the
length of the wall. Finally the joint is mastic filled to make it
weatherproof, but during building 'something' is used to ensure an 8mm gap
in the mortar.

Logically it has to be firm enough to keep the mortar out while setting the
bricks, but able to be squashed as the wall length changes with expansion.

If I cannot find what is 'proper' I intend to use slices of expanded
polystyrene.

Andrew - I've had several occasions lately when nobody has replied to messages.
I gave the answer to this question at 11.10pm last night and I can see it on my
machine, but I'm wondering if I'm the only one who can! ) Could somebody
confirm they can see it too please.

BTW - the answer is Flexcell - it's a bitumen-impregnated soft board
http://www.sundeala.co.uk/flexcell.htm

Peter

"Peter Taylor" wrote in message
...

Andrew - I've had several occasions lately when nobody has replied to
messages.
I gave the answer to this question at 11.10pm last night and I can see it
on my
machine, but I'm wondering if I'm the only one who can! ) Could
somebody
confirm they can see it too please.

I can (via Gradwell's news servers) see this and your previous message.

Cheers,

Will

"Peter Taylor" wrote in message
...
Andrew Mawson wrote

What I'm trying to find out is what is used as the spacer in lateral
expansion joints in long walls whilst they are being built. The two
sections
of wall butt close together end to end, are prevented from moving
sidewise
by normal wall ties fully bedded in a mortar joint on one wall section,
but
wrapped in dpc in the other wall section to allow it to slide along the
length of the wall. Finally the joint is mastic filled to make it
weatherproof, but during building 'something' is used to ensure an 8mm
gap
in the mortar.

Logically it has to be firm enough to keep the mortar out while setting
the
bricks, but able to be squashed as the wall length changes with
expansion.

If I cannot find what is 'proper' I intend to use slices of expanded
polystyrene.

Andrew - I've had several occasions lately when nobody has replied to
messages.
I gave the answer to this question at 11.10pm last night and I can see it
on my
machine, but I'm wondering if I'm the only one who can! ) Could
somebody
confirm they can see it too please.

BTW - the answer is Flexcell - it's a bitumen-impregnated soft board
http://www.sundeala.co.uk/flexcell.htm

Peter


Peter,

Thanks for that link - just what I needed. No your original post doesn't
appear to have got to my news server (news.bt.com)

Andrew

Peter Taylor wrote:
Andrew Mawson wrote

What I'm trying to find out is what is used as the spacer in lateral
expansion joints in long walls whilst they are being built. The two
sections of wall butt close together end to end, are prevented from
moving sidewise by normal wall ties fully bedded in a mortar joint
on one wall section, but wrapped in dpc in the other wall section to
allow it to slide along the length of the wall. Finally the joint is
mastic filled to make it weatherproof, but during building
'something' is used to ensure an 8mm gap in the mortar.

Logically it has to be firm enough to keep the mortar out while
setting the bricks, but able to be squashed as the wall length
changes with expansion.

If I cannot find what is 'proper' I intend to use slices of expanded
polystyrene.

Andrew - I've had several occasions lately when nobody has replied to
messages. I gave the answer to this question at 11.10pm last night
and I can see it on my machine, but I'm wondering if I'm the only one
who can! ) Could somebody confirm they can see it too please.

BTW - the answer is Flexcell - it's a bitumen-impregnated soft board
http://www.sundeala.co.uk/flexcell.htm

Peter

Can see your original post dated/timed 23:10 18th Dec 2003 on
news-text.blueyonder.co.uk

--
Yours S.
addy not usable (not that you would try it)
Utinam logica falsa tuam philosophiam totam suffodiant!
www.killies.co.uk/forums/index.php

"Andrew Mawson" wrote in message
...

"Peter Taylor" wrote in message
...
Andrew Mawson wrote

What I'm trying to find out is what is used as the spacer in lateral
expansion joints in long walls whilst they are being built. The two
sections
of wall butt close together end to end, are prevented from moving
sidewise
by normal wall ties fully bedded in a mortar joint on one wall section,
but
wrapped in dpc in the other wall section to allow it to slide along the
length of the wall. Finally the joint is mastic filled to make it
weatherproof, but during building 'something' is used to ensure an 8mm
gap
in the mortar.

Logically it has to be firm enough to keep the mortar out while setting
the
bricks, but able to be squashed as the wall length changes with
expansion.

If I cannot find what is 'proper' I intend to use slices of expanded
polystyrene.

Andrew - I've had several occasions lately when nobody has replied to
messages.
I gave the answer to this question at 11.10pm last night and I can see it
on my
machine, but I'm wondering if I'm the only one who can! ) Could
somebody
confirm they can see it too please.

BTW - the answer is Flexcell - it's a bitumen-impregnated soft board
http://www.sundeala.co.uk/flexcell.htm

Peter


Peter,

Thanks for that link - just what I needed. No your original post doesn't
appear to have got to my news server (news.bt.com)

Andrew

Ah so - ziss ist werry interesting! Good old BT

Thanks to Will & Soup
Peter

Peter Taylor wrote:

"Andrew Mawson" wrote in message
...

"Peter Taylor" wrote in message
...
Andrew Mawson wrote

What I'm trying to find out is what is used as the spacer in lateral
expansion joints in long walls whilst they are being built. The two
sections
of wall butt close together end to end, are prevented from moving
sidewise
by normal wall ties fully bedded in a mortar joint on one wall section,
but
wrapped in dpc in the other wall section to allow it to slide along the
length of the wall. Finally the joint is mastic filled to make it
weatherproof, but during building 'something' is used to ensure an 8mm
gap
in the mortar.

Logically it has to be firm enough to keep the mortar out while setting
the
bricks, but able to be squashed as the wall length changes with
expansion.

If I cannot find what is 'proper' I intend to use slices of expanded
polystyrene.

Andrew - I've had several occasions lately when nobody has replied to
messages.
I gave the answer to this question at 11.10pm last night and I can see it
on my
machine, but I'm wondering if I'm the only one who can! ) Could
somebody
confirm they can see it too please.

BTW - the answer is Flexcell - it's a bitumen-impregnated soft board
http://www.sundeala.co.uk/flexcell.htm

Peter


Peter,

Thanks for that link - just what I needed. No your original post doesn't
appear to have got to my news server (news.bt.com)

Andrew

Ah so - ziss ist werry interesting! Good old BT

Thanks to Will & Soup
Peter

3 of your postings in this thread are showing on NTL (text.news.ntlworld.com)

Bob