Monday, April 25, 2016

why concrete tiles for roof?

By: Peter Huber
Posted By:BHIS

Ok lets continue where we left of in the last article, on the fact and fiction about roof tiles.

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If you are worried about the usage of concrete tiles when collecting rain water, well there is nothing to worry about as we are assured that the surface of the concrete tile is a suitable surface from which to gather water for drinking, and best results are achieved when an appropriate collection system is fitted.

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If you are building near the coast you also need not worry, as the prolonged exposure of concrete tiles have a proven record of resistance to corrosive atmospheres.
Similarly in tropical conditions the added weight of a concrete roof helps to counteract wind uplift during storms making it less susceptible to damage than some other roofing materials.
Normally concrete tiles require very  little if any maintenance due to their exceptional durability, if some is required then only the affected tile will need to be replaced.

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Cleaning of the tiles is also not  a necessity but Lichen and moss can be removed by high pressure jet water sprays or by the application of a specific chemical formula sold for this purpose of removing the lichen and moss. In fact the formula for the magic potion is this:-  200 grams of copper sulphate, to 4.5 litres of water The average roof will need ten times this amount, the solution is broomed onto the offending areas and eradication will take place over the following couple of months and it should be left to work on its own as the moss and lichen will gradually disappear. On porous tiles the solution has a residual affect as it remains and inhibits any future or early re-growths.

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When using copper sulphate solutions be careful that metalwork such as guttering is protected to prevent corrosive  action. Gutters should be filled with water by blocking the downpipes as any solution running into the gutter will be extremely diluted and not affect the metal gutter.
By comparison concrete tiles are very affordable and generally cost less than metal or clay covering, on most profiles the fit is neat and even, but the coating that is applied to the tiles is still subject to weathering and will eventually wear off and needs re-painting.

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So myths like, Lichen and Moss will eat into your tiles and weathering of the original surface coating makes old tiles porous, is all a lot of old wife’s tales and scare tactics, invented by itinerant traders.

Every so often we would like to publish questions with answers that our readers may have on renovating or building, so please share your comments.

Thursday, April 21, 2016

Tips for choosing roof tile for your home 
By: Peter Huber
Posted By:BHIS

The other day I spoke to a gentleman who asked me, to confirm to him that he needs to replace his concrete tiles on his house with clay tiles, I questioned his rationale and a mountain of misleading  statements flowed from his mouth, perhaps the most memorable was that “as concrete tiles become older they start to leak and there is nothing short of replacing them with clay tiles”

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I must say I have heard many such rumour floating around, all of which I am hopefully about to dispelled. I decided to see if the concrete tile manufacturers have become aware of these rumours and what if any, their official response was?

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After talking to several people connected to the concrete tile industry, a brochure was mailed to us prophetically titled “THE FACTS ON CONCRETE TILES”

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I will summarise and add some of our own comments to the questions and topics covered in this brochure.
The modern manufacturing process makes the tiles exceptionally durable, they are manufactured to Australian standards and the physical properties of concrete will remain unchanged well in the excess of fifty or more years, irrespective of climatic conditions.

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Concrete actually becomes stronger with time and remember concrete is the preferred  material for major structures such as bridges and high rise towers because of its inherent qualities of strength and longevity, additionally it out last other roof cover materials as it does not rust or corrode.
“DO CONCRETE TILES ABSORB WATER AND THEREFORE DOUBLE IN WEIGHT?”  No this is incorrect and a myth. The Australian standards AS1757-1989 actually specifies a maximum water absorption of only 10% per total immersion in water for 24 hrs. In practice the absorption of water by capillary action during periods of heavy rain would increase the weight of the tile by around 5%. Contrary to claims of some roofing companies, this weight increase is unlikely to cause structural roof or stump failure.

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“DOES WEATHERING OF THE ORIGINAL TILE COATING MAKE TILES POROUS?” Not true.  The colour coating is purely decorative and is not designed as a water proofing film. As in most water proof purpose made concrete, water proofing is achieved by using carefully selected, formulated, batched and graded materials which are then compacted during manufacture. This then produces a concrete product of high density and strength which naturally keeps out water.

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“ARE CONCRETE TILES FIRE RESISTANT” yes they are totally incombustible and fully fire resistant according to ASTM (USA)E108-88 tests, there is no comparable test available in Australia.
“WHAT ABOUT THERMAL AND SOUND INSULATION” Tiles  take longer to heat up and tiled roofs usually have a larger volume roof spaces which “breathe” so houses with tiles roofs  stay cooler longer, but once the heat build up accumulates for long periods, it also works in reverse that it takes longer to cool down.

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Due to the greater mass of concrete tiles they do provide a better sound insulating quality than metal roofing, they help to reduce to noise intrusion in particular caused by rain and hail.

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We will continue to discuss the myths and facts of roof tiles