Max Planck. Similar Threads Fencing quote - is this a reasonable price? Tallowwood Flooring - Price reasonable? Trying to get Mum's flat saleable at reasonable price By getmeouttahere in forum Introduce Yourself. Curious - does this price sound reasonable? By LordBug in forum Electrical. The time now is PM. But all types of house rendering have one thing in common — they wrap the building in a protective skin.
Render used to be applied in three layers that got progressively thinner — these layers were known as the render, float and set coats. This will expose bare patches of wall which will need time to dry out before new render is applied. Although rendering a large area is a skilled job, patching is less difficult. Traditional lime render on old buildings should never be patched using cement; this will prevent moisture in the wall from evaporating, forcing it out to the edges of the new patch, eventually causing render to fail around the edges of the repair.
Alternatively, the wall could be covered with a suitable cladding, such as traditional tiles, hung from battens fixed over the old render. On the other hand, they may be indicators of trouble ahead. But in cases where erosion has become excessive, the damaged masonry will need to be repaired or replaced.
Look out for crumbling and spalling brickwork where sections of the brick flake away to the face of brick or stone, and damp penetrating the wall which can sometimes leave white salts on the surface. Walls in exposed areas like roof parapets are especially vulnerable to erosion. The main concern is that once the harder, protective face of the brick or stone has blown, the softer inner body will be exposed and vulnerable to further deterioration.
More serious erosion can result in damp penetration or the structural instability of a wall. Probably the most common cause of brick damage is water trapped in porous masonry freezing and expanding, causing the surface to disintegrate. Similarly, chemical salts in solution derived from groundwater or from the masonry itself can crystalise and expand as the water evaporates out of the wall, damaging the face.
MORE: How to repoint a wall. Deterioration tends to be worse where walls were originally built with cheap, poor-quality soft brick or stone, or as a result of a bad repointing job using strong cement mortars. Spalling can also be caused by damp penetrating from inside.
This can sometimes be seen where chimney breasts adjoin external walls, and the bricks are eaten away by flue gases, following the line of the flue up the wall.
This type of erosion can normally be prevented by lining the flue. Where there are contributing causes of damage, such as leaking pipes or gutters, these must first be fixed. Whether this is visually appropriate will depend on the age and type of property, and of course such work to listed buildings or those in Conservation Areas could require permission from the local authority. Damp in old houses in one form or another is not particularly unusual.
Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Add a stainless steel bellcast bead at wall base, and render this to blend in with the existing render. You may find that some masonry repairs are required, once masonry is exposed at the wall base.
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