Stop Cracks In Render Near Post

[haveaniceday]

So we have a single story home with concrete post and block walls. I see many times, that after 6 months there is crack in the render vertically were the walls meet the post.

I have seen used before what looked like a fine chicken wire mesh over lapping the join to stop this.

Is it worth it? Does it work?

What is it called?

Where do you get it?

The builder doesn't know what I am talking about. I hope I have given enough info for some positive feed back.

[Naam]

I have seen used before what looked like a fine chicken wire mesh over lapping the join to stop this.

Is it worth it? Does it work?

YES, it works but usually the builder clowns are trying to save a few pennies by overlapping only a centimeter or two.

[Naam]

What is it called?

Where do you get it?

wire mesh

building supplies

[PattayaParent]

It's called 'expamet' in UK.

[haveaniceday]

It sounds to easy doesn't it.

I will buy some tomorrow so they have heaps of it. Is it just the common square 10mm X 10mm wire mesh? This stuff is cheap, those cracks are butt ugly, Amazing Thailand again I presume.

The stuff I remember seeing in use, was about 5mm and appeared to be more flexible, but not saying it is better of course.

Do you recommend I get them to wrap it around the corners as I piece?

[haveaniceday]

I have never been involved in this, the builder has never seen it before, I also wonder how much it doesn't help rendering the next day after laying the bricks? TIT

How many cm each side of the join would you put the mesh?

[sotsira]

I have never been involved in this, the builder has never seen it before, I also wonder how much it doesn't help rendering the next day after laying the bricks? TIT

How many cm each side of the join would you put the mesh?

If i understood correctly your op, you're concern is to prevent cracks in the render after a short period of time from the build.

The use of this wire mesh is usually on large surface area walls, to aid the render to bond to the brickwork whilst drying.

The problem with cracks appearing where walls join pillars is a different matter though, it is caused by the difference of movement

between the walls against the pillars.

A preventative measure to this, is to drill holes in the pillar and insert steel pins inside of about 4-5cm in depth, with the same length

protruding outwards, then as the wall is being built the protruding pins will sit in between the bricks to re-enforce the join between the wall and the pillar.

This can only be done whilst the walls are being built otherwise it's too late to rectify the problem.

[Kwasaki]

I have never been involved in this, the builder has never seen it before, I also wonder how much it doesn't help rendering the next day after laying the bricks? TIT

No problem rendering the next day as long as he mixing it well.

How many cm each side of the join would you put the mesh?

On a corner set piece it usually has at least 50mm lap each side from the edge.

As sort of been said tying in brickwork adjoining walls etc etc is essential.

Got a picture I don't exactly get what type construction you are undertaking. ??

[PattayaParent]

I have never been involved in this, the builder has never seen it before, I also wonder how much it doesn't help rendering the next day after laying the bricks? TIT

How many cm each side of the join would you put the mesh?

http://www.expamet.co.uk/content/plaster-and-render-lath

[bankruatsteve]

If you're doing a new build and have solid footings, I doubt you need to worry about cracks next to the poles. Most likely will be cracks in the rendering that covers the bricks. And, for that, I have found it best to wait 4-6 months before painting. Then just use a filler in the cracks. But, that's a different subject I suppose.

[rgs2001uk]

I have never been involved in this, the builder has never seen it before, I also wonder how much it doesn't help rendering the next day after laying the bricks? TIT

How many cm each side of the join would you put the mesh?

If i understood correctly your op, you're concern is to prevent cracks in the render after a short period of time from the build.

The use of this wire mesh is usually on large surface area walls, to aid the render to bond to the brickwork whilst drying.

The problem with cracks appearing where walls join pillars is a different matter though, it is caused by the difference of movement

between the walls against the pillars.

A preventative measure to this, is to drill holes in the pillar and insert steel pins inside of about 4-5cm in depth, with the same length

protruding outwards, then as the wall is being built the protruding pins will sit in between the bricks to re-enforce the join between the wall and the pillar.

This can only be done whilst the walls are being built otherwise it's too late to rectify the problem.

In just about every red brick built house I have seen, the columns have rods inserted that protrude a good 4 or 5 inches out from the column, the wall brickwork is then built up with the rods acting for support/strength.

Would be interested to know if the builder inserted the rods prior to building the wall.

[Kwasaki]

I have never been involved in this, the builder has never seen it before, I also wonder how much it doesn't help rendering the next day after laying the bricks? TIT

How many cm each side of the join would you put the mesh?

If i understood correctly your op, you're concern is to prevent cracks in the render after a short period of time from the build.

The use of this wire mesh is usually on large surface area walls, to aid the render to bond to the brickwork whilst drying.

The problem with cracks appearing where walls join pillars is a different matter though, it is caused by the difference of movement

between the walls against the pillars.

A preventative measure to this, is to drill holes in the pillar and insert steel pins inside of about 4-5cm in depth, with the same length

protruding outwards, then as the wall is being built the protruding pins will sit in between the bricks to re-enforce the join between the wall and the pillar.

This can only be done whilst the walls are being built otherwise it's too late to rectify the problem.

In just about every red brick built house I have seen, the columns have rods inserted that protrude a good 4 or 5 inches out from the column, the wall brickwork is then built up with the rods acting for support/strength.

Would be interested to know if the builder inserted the rods prior to building the wall.

You are referring to tying in products they come in many different ways but basically there for tying in where a join in building projects are required, post to brick or block, brick to piers and corners etc.

[Naam]

If you're doing a new build and have solid footings, I doubt you need to worry about cracks next to the poles. Most likely will be cracks in the rendering that covers the bricks. And, for that, I have found it best to wait 4-6 months before painting. Then just use a filler in the cracks. But, that's a different subject I suppose.

the cracks next to the poles are caused by different expansion / contraction factors of different materials. that applies where brickwork (especially gas concrete bricks like "superblock") and concrete pillars are joined.

waiting a certain time does not solve the problem. the cracks will appear again and again if no wire mesh is used.

[haveaniceday]

There was steel pins of rebar about 8mm diameter across, drilled at least 5cm (unknown how deep) into the collums at 20cm intervals vertically, there were 30 cm long laying horizonataly into the brick wall.

Will the collums move, dun't know. It is a small bungalow style, with better foundations than most.

Naam, do you mean just welded square mesh, 10mm X 10mm? I see 1/4inch in one shop, is that the go?

Home mart staff had never heard of such use of it.

[Naam]

Naam, do you mean just welded square mesh, 10mm X 10mm? I see 1/4inch in one shop, is that the go?

don't know how to describe it. looks like this:

[haveaniceday]

Thanks, I presume that is 1/4 inch mesh (6mm).

[rgs2001uk]

Thanks, I presume that is 1/4 inch mesh (6mm).

I am waiting on some photos coming, I should be able to post tomorrow.

What you want is mesh, the Thais know it by this name.

The Home mart staff are clueless.

[rgs2001uk]

Here are the photos I was waiting for,

[haveaniceday]

Thanks, went and got a 100 foot roll of (about 10mm) welded steel mesh.

The just used 1 inch nails into the mortar to secure it. really easy, and doesn't appear any harder for them to render.

Thanks for the advice.

[Daffy D]

I used a ready mix cement that comes in plasic bags with Latex marked in yellow to fill the cracks.

Seems to work better than regular cement.