best mortar mix for repairing bad blockwork

[iNf]

From our recent extension to give you an idea

 

[iNf]

You can see the corner of the wall tie is shaped to give strength.
The strip on the left is used to tie a new wall to an existing one. You screw it to the existing wall and the inserts go in the channel between the new wall courses. If that's what they used they are pretty standard.

 

[gaz1]

wall ties are done to fasten your roof too they dont stop the spreading as thats within your roof frame

 

[DAPPH]

Watch out for the dosage of the plasticer in small batches. I struggle not to overdo it if I'm doing a part mix of a mixer. In a bucket, you might need a pippet

Plastering afterwards will cover many sins and add a little strength.

Tyrolean render after that will hide even more.

Re small amounts of mortar with plasticiser
Make your dosing water up in a plastic dust bin and measure how many litres/ gallons it holds to get the right strength a simple hook of wood hung over the lip of the dustbin can be cut to repeat the volume in the bin . Then us a small can to decant it to the mixture bucket at the end of the day pop a lid on the dust bin to keep insects & rain out .

 

[addjunkie]

From our recent extension to give you an idea
View attachment 489807

The way I did the ties was to bed the wall plate on motar, once dry, fitted the L shaped ties as shown. Then once we had built the roof 8x2 timbers, added extra ties down from the roof timbers to the walls. Building inspector was quite insistent on this, us being quite exposed. These ties were also added to the truss roof in addition to the supplied metal work for fixing the trusses.

https://www.screwfix.com/p/simpson-strong-tie-twisted-restraint-straps-600mm-10-pack/308tj

 

[chunkolini]

That all looks simple regards the roof.
I had a go at the walls yesterday 4/1 mix with some plasticiser. I cut up an old half gallon container to use as a measure so proportions were easy.
Some of the gaps are miles deep but I think filled to the back
24 hours later the mix seems a bit soft and dusty. Scrapes and dents fairly easily. does it need longer to go off? too much water? cement use by date is december 25
The bricks I refitted seem sound, certainly looks more betterer

 

[gaz1]

too much yellow and youve got too much sand in the mix

too white and theres too much cement it depends on your mix

cement wont fully set for a few days then it hardens

just so we are clear if you cement the top and place wood on the top and tap it level as soon as it sets and you drill it down you losen it

if you predrill it then lay cement tap it down and screw it then it becomes solid

does it really need to be done that way not really just screw it down on top of the blocks thats more than ample enough and because your also fitting wall ties your also tieing the roof down to the walls by 1 meter

 

[Blobber]

It will take a few days to properly harden so I wouldn't worry too much

 

[CornishPete]

What is it you're building? Looks like a retaining wall with a single skin building on top?

 

[gaz1]

What is it you're building? Looks like a retaining wall with a single skin building on top?

his previous build pics pete

Post in thread 'new shed build tips'

Oct 8, 2024

I've had the old 'retaining wall' replaced ha! It was a skin of textured blocks and a few bricks somehow supporting tons of loose dirt.
There built a proper block one and we're having a new slab poured on top of the old one up to the level of the street.
I should have detailed this earlier.
Old 'wall' A shocker

New wall

Four courses of blocks at the back to street level.

The Chuckle Brothers have worked hard.
Bless them.
Plan A.
When the slab is poured build a new pillar on the wall and make a 1.2m gateway. That's if the wall stays up
Then bring the...

• chunkolini

 

[chunkolini]

Yep
Retaing wall was the start
Built with his mates before they fell out.
After that quality started to suffer.
But I will.have my Man Cave in the end

 

[CornishPete]

Was going to say the bottom half doesn't look too bad from where I'm sitting. Top half a little less so! I assume it's being rendered? If so pointing isn't too much of an issue! Likewise if internal walls will be covered with plasterboard block work doesn't need to be particularly neat. The new through colour monocouche renders are really popular and do a good job waterproofing compared to traditional sand and cement but might be worth looking into a lining system (if you haven't already!) if it's just a single skin?
Anyway, once you reach your destination the journey becomes less of a focus!
Regards!

 

[brightspark]

No, 'L' shape with the short leg fixing into the top of the wall plate.

Like so:

View attachment 489806

( Screwfix )

IIRC, they should come down 1m / max spacing 2m (if you're fussed about any sort of regs. - If so, double check, as my info is about 20 years old).

the straps are to hold the roof down in stormy high wind conditions thats why they are so long down the blockwork. ive seen a few that hadnt them fitted and the complete lot blew off woodwork and tiles in one lot

 

[Gritineye]

Whats all this messing about with Febmix? I stopped using that the day Mastercrete appeared on the market!

 

[dobbslc]

But it makes it so soft and squishy.

 

[Bobtail4x4]

you say that to all the girls

 

[chunkolini]

Update this morning.
Thar has set a treat after 48 hours
A bit more of this then put the frame around the top of the walls prior to fitting joists. Frame will be bolted into the sound blockwork and fitted with internal ties as described above.
Top work chaps.
I'm winning not whining

 

[addjunkie]

Use concrete screws to fix the ties to-the block work