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bondbunny 发表于 2015-8-3 09:18 
哈哈，有人说过，Plaster房子只分二种~现在漏的或将来漏的。其实这个年代plaster的致命点是内部骨架未进行 ...
What's wrong with these older monolithic claddings?
Water gets past the outer surface and cannot escape fast enough, so the framing starts rotting. It really is that simple.
Nowadays the mantra "All houses leak" is widely repeated and believed - but not so between 1994 and 2002. In that era it was equally widely believed that houses could be built so they didn't leak - or at least, any leaks would be so small and short lived no problems would develop. This has turned out to be untrue. The problem is generally with all the gaps and holes in the outer skin - wherever there is a window or a door, for instance. Water sneaks in at the junction between the cladding and the window or door and it cannot escape or dry out quickly so it soaks into the framing. Not just here - water may soak up from the ground outside, or run in from the edge of the roof....the list of possible entry points is virtually endless.
The 4 Ds
A good way to understand the changes the residential construction industry has gone through since about 2001 is via the 4 Ds. This also helps to understand what is wrong with so many of the houses built during that 1994 - 2002 period:
Deflection
If the roof sticks out, it will protect the walls and reduce the amount of water hitting them. No eaves puts a greater demand on the cladding.
Drainage (the cavity concept)
If the cladding - whatever it is - is stood out, away from the framing then any water getting past has an easy route to run away - like brick clad buildings have always had.
Drying
Good air circulation means any wet building material can dry out again quickly. This is achieved by ensuring there are small gaps along the bottom of the cavity - generally this is all that is needed. Additional gaps along the top are sometimes seen (especially with brick).
Durability
If all the materials - especially the framing timber - is durable enough, it doesn't matter if a little bit of water does reach it every now and again, this wont be enough to allow rot to start.
So when you look at a typical monolithic clad house from that period 1994 - 2002, it is easy now to see how frequently none of these four concepts got a look in - no wide protecting roofs, so more strain on the wall claddings. No drainage because the cladding was directly fixed to the framing. Likewise, very limited air circulation in there to dry things out. Finally, kiln dried untreated timber which can rot frighteningly fast. |
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发表于 2015-8-2 22:15:27
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