Difference between revisions of "Problem Constructions"
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==Timber Frame== | ==Timber Frame== | ||
| − | [[: | + | [[Image:DoubleJettiedBuilding.jpg|thumb|right|English half-timbered terraced house]] |
| + | [[:Category:Period Property|Timber frame]] buildings are relatively common. Unfortunately so is [[Mortar Mixes|cement]] render on timber frame. This traps [[Damp Links|damp]] in the frame, and sometimes leads to [[Wood Rot|rot]] of the frame. [http://www.buildingconservation.com/articles/mortgage/mortgage.htm (ref)] Repair can be costly. Prevention consists of using only lime or earth based renders on the building, and only lime or earth based porous paints. [[Mortar Mixes|Cement renders]] and modern impermeable paints should be avoided. | ||
==Earth Buildings== | ==Earth Buildings== | ||
| − | + | [[Image:Ancient Bam, 2002.jpg|400px|centre|The citadel of Arg-é Bam: The world's largest adobe structure, dating to at least 500 BCE]] | |
| − | + | Known variously as cob, earth, adobe and other names, earth buildings are part of Britains [[:Category:Period Property|historic housing stock]]. While these work well enough as designed, common modern alterations can lead to significant structural problems. [[Mortar Mixes|Cement]] render tends to cause [[Damp Links|damp]] walls, and when the cob reaches a certain level of water content, it loses its strength and can collapse. Although not common, there have been cases where the cement render had become structural due to failure of the cob, caused by the cement render. | |
| − | + | [[Mortar Mixes|Cement]] rendered earth should generally have its render removed, and be rerendered with lime, which is porous enough to permit any damp in the wall to evaporate out. Precautions are needed in doing this, as it could in rare cases cause collapse if done wrongly. | |
| + | Replacement roofs can sometimes be an issue with earth buildings, as these buildings require generous roof overhangs to remain in good health, and these are not normally provided on modern roofs. | ||
==Reinforced Concrete Buildings== | ==Reinforced Concrete Buildings== | ||
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Abbey and Halifax lend on steel frame. | Abbey and Halifax lend on steel frame. | ||
| − | Ecology building Society lend on a minority of derelict houses, but only with a low income multiplier. | + | Ecology building Society lend on a minority of derelict houses, but only with a low income multiplier. [http://www.ecology.co.uk/html/mortgages/whatlendon.htm ref] |
==See Also== | ==See Also== | ||
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[[Category:Period Property]] | [[Category:Period Property]] | ||
[[Category:Wood]] | [[Category:Wood]] | ||
| + | [[Category:Masonry]] | ||
| + | [[Category:Structural]] | ||
Latest revision as of 12:53, 10 August 2017
There are 4 main types of construction especially prone to structural problems.
Timber Frame
Timber frame buildings are relatively common. Unfortunately so is cement render on timber frame. This traps damp in the frame, and sometimes leads to rot of the frame. (ref) Repair can be costly. Prevention consists of using only lime or earth based renders on the building, and only lime or earth based porous paints. Cement renders and modern impermeable paints should be avoided.
Earth Buildings
Known variously as cob, earth, adobe and other names, earth buildings are part of Britains historic housing stock. While these work well enough as designed, common modern alterations can lead to significant structural problems. Cement render tends to cause damp walls, and when the cob reaches a certain level of water content, it loses its strength and can collapse. Although not common, there have been cases where the cement render had become structural due to failure of the cob, caused by the cement render.
Cement rendered earth should generally have its render removed, and be rerendered with lime, which is porous enough to permit any damp in the wall to evaporate out. Precautions are needed in doing this, as it could in rare cases cause collapse if done wrongly.
Replacement roofs can sometimes be an issue with earth buildings, as these buildings require generous roof overhangs to remain in good health, and these are not normally provided on modern roofs.
Reinforced Concrete Buildings
Reinforced concrete buildings suffer from rusting and consequent expansion of the reinforcing steel, which breaks the concrete apart. Most of the compressive strength of the building material is thus lost. These are known as a defective building type, and obtaining mortgages is difficult if not impossible.
Steel Frame
Steel Frames rust, and houses may have frames that are impossible or impractical to inspect, thus the condition of the frame can not be determined.
Mortgage Companies
Abbey and Halifax lend on steel frame.
Ecology building Society lend on a minority of derelict houses, but only with a low income multiplier. ref