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You only get one chance to in­stall roof sarking, so you might as well do it once and do it right.

It can only be done dur­ing the process of build­ing the struc­ture of the roof, but be­fore the tiles go on.

It acts as a sec­ond skin, pro­tect­ing the home against mould growth, and im­por­tantly, against the en­try of storm-driven rain into the roof cav­ity.

Although con­sid­ered an “op­tional ex­tra” by some builders, Bo­ral’s Harry Tan­ner says this is not some­thing you can af­ford to skimp on.

“It’s not manda­tory for builders to do this, and it might save you some money in the short term, but it does put home­own­ers at risk,” says Harry.

“The idea is that sarking acts a bit like a rain­coat. When rain is wind driven the wa­ter can slide un­der the tiles, and that can hap­pen to all roofs re­gard­less of what ma­te­rial they are made of. Sarking stops the wa­ter from dam­ag­ing the ceil­ing, dis­charg­ing the wa­ter into the gut­ter and there­fore pro­tect­ing the home,” he says.

“The other thing is, when the weather gets cold, con­den­sa­tion forms on the un­der­side of the tiles and wa­ter can trickle from that.

“That is another ben­e­fit of sarking.”

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