Roof RePointing Gold Coast :
• Roof RePointing ridge capping and roof hips, refers to the top of the roof and the joins where the tiles meet. Where the tiles from one section of the roof meet up with another, this area requires a special covering tile, called a capping tile. This is to cover the gap between the roof pitch on one side, with the roof pitch of the other. The place where the two roof pitches meet or roofing sections is where water leaks are likely to occur.
• Many people do not actually get on the top of the roof to see the damage up there and thus don’t realise how bad it can be until they are finding leaks showing up on the ceiling.
• Sun, wind and rain on the roof of your home over 15-20 plus years, means you will certainly have a need to at least re-point the ridge capping and hips, replace a few tiles and adjust a few others and that may be all that is needed, to last you another 10 years of trouble free living.
Why re-bedding and re-pointing a roof is so important :
• Many home owners don’t realise that the most important aspect in a tiled roof restoration, is rebedding and repointing the roof tiles. If only it was as simple as a quick pressure clean and a lick of paint.
Step 1 – Roof Repointing the ridge capping :
In most cases ridge capping can be just repointed by troweling over the existing mortar & filling any cracks properly.
Step 2 – Rebedding the ridge caps :
If the existing mortar is loose & falling out the ridge capping needs rebedding which requires all the the ridge caps coming off.
Step 3 – Fresh mortar :
The old mortar is then discarded & fresh bedding mortar is applied.
Step 4 – Repointing :
Ridge caps are then repointed & colour matched to suit the roof tiles.
• Repointing is the process of renewing the pointing, which is the external part of mortar joints, in masonry construction. Over time, weathering and decay cause voids in the joints between masonry units, usually in bricks, allowing the undesirable entrance of water. Water entering through these voids can cause significant damage through frost weathering and from salt dissolution and deposition. Repointing is also called pointing, or pointing up, although these terms more properly refer to the finishing step in new construction.
• Examining the structure before working will also help establish the strength and permeability of the original mortar in order to match the new. It helps to establish what the original components of the old mortar are in order to find the best match. It is essential that the mortar used for repointing have similar performance characteristics to the original mortar used in a building. Such performance characteristics include permeability, compressive strength, and coefficient of thermal expansion. The mortar must have greater vapour permeability and softer compressive strength than the original mortar. The mortar should also not be stronger (in compressive strength) than the masonry units because it will not have give. This is when the face or outer section of a masonry unit breaks away from the rest of the unit. So for example, if a soft lime-based mortar was originally used, the most appropriate repointing mortar is likely to also contain a large amount of lime.. Source: Wikipedia