Give careful consideration to how the whole roof system will perform at a low pitch and check compatibility. All of our low pitch tiles have matching fittings and accessories for ease of installation and additional protection.
A low pitch roof on an extension may have to deal with an increased amount of water coming from a larger roof above, so it needs to be designed carefully with consideration given to where the water run-off will be.
On adjacent roof slopes of varying pitch, set batten gauge to the lower roof pitch to ensure alignment at intersections.
Another area to watch out for with low pitch roofs is ventilation. Normal contour vents can usually only be used down to a pitch of 20 degrees, so tile vents are not always suitable for low pitch installation. Instead a dry fix eaves vent system can be used.
Nail holes in cloak verge half tiles should be sealed with mastic, when used on roof pitches below 25° and should be clip fixed where required.
For pitches below 35°, or valley lengths exceeding 5 metres, valley width may require increasing to cope with the additional flow experienced during storm conditions.
Ensure the correct minimum headlap is used for the particular tile, pitch and rafter length combination. If there is any doubt or if the rafter length is in excess of 6m users should contact Marley's free Technical Advisory Service for further guidance.