A FILOFACTS ON …. POINTING & GROUTING

In Telegraph of 13.4.14, the paper’s DIY and building consultant, Jeff Howell, was asked his opinion of mechanical re-pointing tools. He commented:
“As with any method of repointing, the main problems are that (a) it is usually unnecessary, and (b) it is often done badly, causing damage to the brickwork.
“The mortar between bricks (for which also read ‘stones’) should be viewed as a sacrificial medium. It should be softer and more breathable than the bricks themselves, allowing movement and the passage of moisture. It is natural for the mortar to weather away over the years, leaving the bricks intact. After perhaps a century or so, re-pointing might be needed.
“Unfortunately many home owners, and some ignorant surveyors, view even minor erosion of the pointing as a defect, and think the wall should be spruced up by raking out and repointing.
“All raking-out will cause some damage to the edges of the adjacent bricks, no matter what tools are used. The joints will become wider, meaning that the re-pointing will take up a larger proportion of the wall’s area and change its appearance. Re-pointed walls often look as if they have been redrawn using a blunt pencil.
“In the event that re-pointing is really necessary, it should be done using a soft lime-and-sand mortar – this is especially important for pre-1939 buildings. If lime-built brickwork is repointed with hard cement-based mortar, the pointing is quite likely to work itself loose within a few years, but not before it has hastened decay of the masonry by cracking, spalling and frost damage.”
Next question was:
“For years I have been filling in the spaces between paving slabs that were put down when the house was built. Overall it is a considerable area. Every year the cement once again breaks up and the spaces are back. What I would envisage would be a sort of large icing bag which one would squeeze and fill in the spaces permanently with a liquid substance. Is there a way?”
Sir Jeff, as he is known in The Shed, replied:
“As with my previous answer, I have to report that the problem lies with the materials, not the tools.
If your paving slabs are bedded on sand, then they will move around in response to all sorts of influences – thermal and moisture expansion/contraction, impact from human traffic, and growth of tree roots. There is no point filling the joints with anything other than sharp sand.
“If the slabs are bedded on concrete or cement-based mortar, you’ll have more of a chance with pointing or grouting. The same principles apply as before – the mortar should be softer than the paving slabs. Try a 6:1:1 mix of sharp sand, cement, and hydrated lime. Rake the joints out fully and brush or vacuum the dust out. Damp-down the joints with a fine spray from a hosepipe, and press the mortar (which should be of a stiff consistency) firmly into them. When the mortar has started to cure (after an hour or two) tool it smooth with a brick jointer or piece of metal pipe. Cover it up to protect it from frost, and in dry weather keep it moist and covered with polythene for a least a week.
“You must accept, though, that exterior paving slabs are constantly exposed to the ravages of the weather, and no matter how well you do the job, it won’t last forever.
* See also the Filofacts entry on cement etc. at
https://hack4hire.wordpress.com/2013/07/15/a-filofacts-on-cement-etc/
* For more Jeff Howell, see http://www.askjeff.co.uk/

endsfornow

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