Wall Tie Remediation work

AliMen

Hi everyone - I  have been told that I need to undertake wall tie remediation work to the rear and side elevation of my end of terrace which was built in 1939.  I had an independent survey done as a result of poor advice I was given in 2014 and am glad I did because the wall ties on these weather struck elevations of the house are not in good shape.  The surveyor recommends that the wall ties are removed and replaced on a one for one basis because the inner leaf of the wall is constructed from Phorpes blocks which basically are very hard with 3 chambers within each block.  The ties will need to be resin-bound into place.   I have had one person return a quote - I am struggling to get quotes back - and he has given me a quote to drill in new and also a quote to replace 1 for 1.  The first is for £2,970 before VAT and the second is for £6,760.  Has anyone out there got more knowledge on this than me because I am now tempted to ignore the surveyors advice to replace 1 for 1  but either way - are these quotes about standard or do they seem on the high side?

grumbler

AliMen said:

the wall ties on these weather struck elevations of the house are not in good shape. 

How can the surveyor know this? Normally you cannot see the ties.

stuart45

Do you know what type of ties you have? eg butterfly, or thicker twist types.
Have you got horizontal cracking in the joints or bulging in the masonry?

Murmansk

I had all the wall ties replaced on a 1930 three bed semi about 12 years ago. It cost £1,600 and took one man one day.

The walls (internal and external) were made of brick. I could see it needed doing as the house developed horizontal cracks every metre or so vertically, and at the corners I could see through the corner because of the cracks.

What they did was to drill around the old rusty/expanded ties to isolate them and stop them pushing the bricks apart, they put in expanding foam to fill the resulting gap and then mortar on the outside. To replace the ties they put new stainless steel ties through the centre of the bricks every metre or so both vertically and horizontally and filled the resulting holes with red mortar.

So in my experience they don't exactly REPLACE the ties they ISOLATE them and put NEW ties in which I guess will often be nearby but not necessarily in the same place. If you need resin fixings (presumably because your inner wall is relatively soft/less dense) then I guess that would increase the cost and complexity.