Re-Pointing Brickwork

[Roady]

I started here in getting some advice and opinions: https://forums.overclockers.co.uk/threads/exterior-wall-maintenance-advice.18954815/

Which has lead to me teaching myself how to re-point brickwork. I've read a bunch online and looked at so many YouTube videos, it felt good this weekend to actually make a start. So thought it could be cool to document what I've done, maybe a little of the why, but also the costs involved.

Stage 1 - stripping back/repairing water damage

Tools (so far) - I took advantage of local Toolstation for the first stuff as couldn't find a Plugging chisel elsewhere. Then got more supplies from B&Q as they have/had vouchers £10 off a £50 spend and ease of getting stuff on a sunday/click & collect etc:
Plugging Chisel - £8 Toolstation
1kg club hammer - £9 Toolstation
Trowel set - £15 B&Q
Wire brush set for drill - £2.66 & £2 Toolstation
Safety goggles - £6 Toolstation
Hand wire brushes - £4 Toolstation
Mortar gun - £13.26 B&Q
Blue circle mastercrete cement 25kg - £5.54 B&Q
4x Tarmac builders sand Large bag (approx 23kg) - £8.12
Various other things like measuring jugs, buckets and scrubbing brushes (actually got from B&Q for ease).

Method / reasoning / what I'm doing
The wall I've started with is the rear wall (with a door) of the garage which faces south. The paint peeling in places was the worst of the property, it's exposed to more wind and rain so the water damage/ingress is the worst point. Also huge benefit for me is it's hidden from view so I can practice and figure out what I'm doing, while getting the skills required to do a tidier job of the rest of the house. The property built in the 70's during a brick shortage, so half of it is 'builders bricks' and painted white. This is the area I'm working on. The upper brickwork is in a better condition and will not need any attention - so I have no danger of working at height while doing this.

Resources:

Repointing Brickwork: Your Step-by-Step Guide

Repointing brickwork is an essential job if you want your home to weather the elements and still look good. Here’s how to do it properly

www.homebuilding.co.uk

How to Re-Point a Wall made easy including Tips and Tricks with Tibby Singh!

Tibby Singh shows everything you need to know about Re-Pointing a wall.He demonstrates 4 main methods of pointing which includes, pointing with:- Trowel and ...

www.youtube.com

Making Old Brickwork New Again - MARSHALLTOWN®

Marshalltown offers a full lineup of masonry, brick, drywall, plastering, concrete, mixers, asphalt, paint, tile, flooring, equipment, and other quality tools.

marshalltown.com

How to: Pointing & Repointing Brickwork - Sunrise Tools

General guidance on how to rake out tired mortar joints and the process for replacing with fresh mortar

www.sunrisetools.co.uk

How To: Repoint Brick Walls

Repointing brick walls and chimneys with new mortar will not only enhance their beauty, but ensure that they remain secure, stable, and sound for years to come.

www.bobvila.com

Pics to come shortly along with weekend #1 of plugging work

 

[ANDARIAL]

if you have a lot to point a 4" angle grinder for the horizontal joints saves a lot of the effort/work needed
vertical joints are a bit trickier so best use a pointing chisel

 

[JBuk]

if you have a lot to point a 4" angle grinder for the horizontal joints saves a lot of the effort/work needed
vertical joints are a bit trickier so best use a pointing chisel

Can also get a small carbide tool that attaches to the grinder that can sink in to narrow places

 

[ANDARIAL]

Can also get a small carbide tool that attaches to the grinder that can sink in to narrow places

Forgot about That gadget.any good?

 

[JBuk]

It’s a little bit less messy than a stone cutting disk but takes slightly longer , if the mortar is very tough it can be difficult to cut , my mortar was like dry soil so it was easy and I didn’t cause huge dust clouds so my neighbours didn’t complain

Re plugging chisels , ok for very small jobs (1 or 2 joints) but you’d be there forever raking out if you have a whole wall


Mortar guns are handy but I’d recommend using plasticiser in the mortar and less water or you’ll end up just squeezing the water out the gun and blocking the end with the compressed mortar

Gotta get the mix just right and ensure it’s mixed very well, I use a mortar mix paddle attachment on my drill

Also dampen the wall before pointing and don’t do too much before trimming the excess and trowelling or it’ll harden too fast and make difficult to get a finish

 

[Roady]

if you have a lot to point a 4" angle grinder for the horizontal joints saves a lot of the effort/work needed
vertical joints are a bit trickier so best use a pointing chisel

I considered it but had heard you can easily damage bricks with them. Didn't have much to do so got the pointing chisel figuring I'd do a tidier job - not convinced I did but that's another story...

Also don't have a grinder (have considered getting a grinder for a while) but it didn't happen this time... One of the main things I was looking at was stripping the multiple layers of old paint from the brickwork before repainting to get a good finish avoiding any future flaking. A grinder/wire brush type setup would've been best for that... Decided against it as the brickwork isn't great anyway and lots of things online saying you generally end up doing more damage than good to the brick surfaces. Certainly the rest of the house looks better than where I've been working, plus the brickworks being 'builder bricks' means they're not very tidy compared to the 1st floor - no point exposing them, so therefore no need to totally strip paint from them. Also came to the conclusion that a print stripper would be the best way, before then a grinder/wire brush combo to finish up/remove semi-loose. But again, do more damage to the bricks than required - as not exposing them, so don't need them 'perfect'.

May still get a grinder, but more with the aim of roughing up the paint surfaces and removing the rough/loose before repainting. Have wire brushes for my battery drill I'll use first and see how I get on. It's an old cheap/budget Dewalt which I killed a battery of a while ago - I'm not expecting it to survive so will replace it as needed - aiming to go the combo route of a drill/grinder set and then standard type batteries which cross between. Dewalt/Makita/etc

Can also get a small carbide tool that attaches to the grinder that can sink in to narrow places

This was mentioned in the other thread, quite an impressive tool (+ there are others), but well over my price bracket. Might be possible to hire one and you would get quite a consistent finish over a large area with one.

Arbortech ALLSAW AS175 Brick and Mortar Saw (230V) - Machine Mart - Machine Mart

www.machinemart.co.uk

It’s a little bit less messy than a stone cutting disk but takes slightly longer , if the mortar is very tough it can be difficult to cut , my mortar was like dry soil so it was easy and I didn’t cause huge dust clouds so my neighbours didn’t complain

Re plugging chisels , ok for very small jobs (1 or 2 joints) but you’d be there forever raking out if you have a whole wall

Great advice and pointers... I'd already been dampening the wall and it worked well. Have also continued to daily/twice daily mist the wall with water after I did the mortaring on Monday - also semi-covered it and fully shaded to protect it from as much of the crazy sun this week as possible - only uncovered it last night. It looks good! Hopefully I've done well protecting it so it cures well... Although my mix came out slightly watery (would kinda also stick to the trowel inverted but not as good as I'd seen), while also quite sandy. It seems to have dried well and feels pretty hard - did a 4 parts sand to 1 part cement (Blue circle mastercrete) mix, but without plasticiser. I did get a mortar gun, but I didn't end up using it, will try and return to B&Q.

 

[Roady]

Rear wall before I started:

Have not done anything this side yet:


Day1:


After 5 hours of work:


Not sure why, but didn't take any pictures of the plugging. It was a hot afternoon so I just cracked on. Tunes on and gradually worked my way along. I found the bricks being quite poor that the corners and edges of them would come away as I chipped the mortar out. They're hard red bricks, so I guess just weaker on the surface. Also didn't help whoever built the wall some of the 'perps' (vertical bits - the flat bit is the 'bed') where almost narrower than my plugging chisel, yet further along some of them almost triple the width. Very sloppy bricklaying! The beds all fairly even with only a couple of tighter bits.

The technique I used I found it easier to do the beds first - just easier to get in a line and keep plugging away. Generally at a depth from 1.5 - 3cm depending how it came away. Several points the mortar would disappear into a cavity behind - almost like the bricks had a concave area, or the mortar was not across the whole brick surface. These areas I put a bit of a mark above them so when it came to repoint I put a bunch more mortar in to fill it. I found when plugging to 'dink' the surface of the mortar first to almost fracture the layers of paint, then when I plugged it came away in smaller bits rather than massive lumps coming out (as found they generally damaged the brick edges then too).

 

[Roady]

Day 2:

While plugging away I could see the bottom 'lip' thing moving and generally coming away. So I pulled it off. The plan has always been to either remove, or repair this and refit it. I don't even know what it's called and have drawn a bit of a blank finding out, finding a replacement, or even really knowing what it's for. I'm inclined to think what I've seen online about it's like a 'run off' for rainwater and/or splashback from rain on the patio slabs to run off away from the wall base/foundations.

I'll continue in my other thread about this - as want to just do the repointing work in here - why I did a separate thread for it!



As I investigated the looseness of the render below this plinth, I found air cavities and the render is actually mostly a thin 'rubbery' bitumen (paint?) on there had lots of splits/gaps in it. The water has obviously got behind it so I need to strip this off and repair behind, cover again with some kinda render (I guess) to protect the brickwork. The surface of a brick there came off (a 'spalled' brick) and needs replacing. Have another at the doorway where the corner has come away... Going to try and replace these myself (now I'm happy with the repointing)!



So after another 4-5 hours plugging work on the sunday:


I realised then I should probably stop. The couple of courses I've left near the doorway are perfect. Did 1 above them which had swelled out and a couple at the bottom.

 

[Roady]

Monday night I couldn't wait any longer and wanted to get mortaring!

I went for a 4-1 mix. Not sure why but that's what I'd read somewhere! So using a 1L jug levelled off of each...


But I found it far too watery... Did another 1L jug of sand with around 300ml of cement had my mix.


It felt pretty good and would just about hold on an inverted trowel... Maybe not as good as Tibby's so couldn't really work like he did - mine wouldn't stick to my brick jointer! I tried a few times and gave up, so used the pointing trowel with came with my set, putting around this much on my plasterers trowel each time:


Pointing trowel 'scooping' into the beds like this:


Around 10-15 mins after smoothing around with the brick jointer:

 

[Roady]

1/2 brick jointing:


I then scraped off the 'snots' as best I could with the pointing trowel, this fetched a bunch of it off. I then brushed (in circles) over the top with a soft brush (an old floor brush). Looking afterwards I maybe did this too soon - it seemed to take a bit too much off most of the pointed surfaces than I would've liked:


I tidied everything up and then misted the surface with a spray nozzle on my hose:


It still looks good - will take another picture tonight a few days on as it has faded colour wise quite a bit now. I'm really 95% happy with it. At least for a first attempt! When I do the other corner wall I won't be brushing it as hard afterwards - probably won't even brush it for a few hours. I'll also see if I can patch a few of the worst bits and see if the mortar will stay there. Not a huge problem to plug out a section to re-do it at this point now I know how!

For my original 5L of mortar & sand mix I'd originally put in 1L of water. It was too much - I think possibly the sand I got from B&Q was carrying too much moisture. It came out the bag quite soggy feeling (so I'm blaming that!) and I added another 1L sand and 300ml cement. This came out quite sandy, although it was good to work with. Next time I'll likely try less water. Quantity wise it was about perfect for the area I did. I used around half of a 25kg bag of sand and only 1L of the 25kg bag of cement so have a bunch of both left...!

I leant an old pallet and a board against the wall to 'cover' it from the really hot sun we've had. Misted it with water every morning and afternoon (once the sun is off it). Last night (48h after) I removed the boards/shade so it is exposed to the sun today...

 

[Roady]

Pics from last night (so after 24 exposed/uncovered). A few close ups so you can see how the surface looks. I'm happy with it - but a couple of rough bits I'm going to put some mortar in to level them up a bit and see if it holds. If it doesn't may just re-plug a couple of inches wide section to do it. It's dried/cured really hard, can't mark it with a thumbnail, so I'm fairly sure my 'wet sandy mix' actually came out well enough!?


Side on so you can see some of the roughness


I brushed this side less (as it was generally tidier and didn't need as much clearing), looks super smooth


The whole section cleaned up. I'm going to get a cloth on the bricks to clean them a bit more - but also figure out what I'm going to do with their painted surfaces before re-painting.

Also nicely shows the bottom area I need to sort out/probably plug & point to check how the bricks are on these 2 bottom courses, before protecting again with some bitumen paint. Maybe if it looks good and I can be sure I'm protecting it well, render it rather than putting the plinth thing back...!?

 

[robj20]

When me and my dad did the back of his house we bought a cheapish black and decker drill and a load of decent drill bits and used that sideways to take out the old mortar. Drill survived and went through about 10 drill bits, made it easy as well.

 

[Roady]

Yeah I saw these 'raking bits' but with only a cheapy poor battery drill (with only 1 battery) figured doing it by hand. If I had more of an area to do I would consider it - much more control than a grinder.

https://www.amazon.co.uk/Faithfull-Masonew-producty-Mortar-Rake/dp/B0001IWSR4

Brick Removing Mortar Raker

This brick removal mortar raker is a great long-reach tool that allows you to remove bricks easily and without causing any disturbance to the rest of the wall. The tool enables fast and efficient removal of old and perished mortar from between bricks and stonework. You can make light work of...

www.toolstation.com