Installing a slate roof requires specific understanding and skills but by using some fundamental rules and staying away from common errors slate roofing can also be inside the abilities of non-professionals. To get it done properly, you need to adopt the next practices:
- General working practices
Don’t walk around the slates during installation. Always work off roof ladders and roof scaffolds. This really is to prevent sliding slates, i.e. slates that break or disappear after installation. For more information on slate roofing, visit our website.
Chalk your slate courses. Install every course along a lasting chalk line on the top of roof. Don’t chalk around the slates themselves. The lines mark the very best edges from the slates. Measure where to place your line from the foot of the roof to make sure precision and consistency. Don’t lay the slates without chalk lines as possible easily lose your headlap and ruin the roof.
- Starter course
The starter course is among the most significant courses on the slate roof and also you must do the installation properly. First, nail a wood or copper cant or shim underneath the base from the starter course. This can tilt the starter course that it is in the same position as other slates. Then install the starter course using the slate face lower and also the support. The starter course may be the only course that’s installed by doing this. Other slates are set up using the face-up, exposing the bevelled edges.
Install the starter course and also the first span of field slates simultaneously. Don’t run the starter course in front of the first course unless of course your starter slates are identical width because the field slates and just have nail holes on top edge. By doing this you’ll have correct side laps and ensured that no nail holes within the starter slates within the joint between your first course slates can produce a leak.
- Side laps
Make certain you develop the right side slaps, i.e. the lateral overlaps between your side butts from the starter slates and also the first span of slates. Along side it laps ought to be no less than 8 cm.
- Mind lap
Every slate must overlap the 2 courses below and you’ve got to actually install the right mind lap. Mind lap keeps the roof water tight. When you get it wrong your roof will leak. The mind lap for 8:12 and steeper sloped roofs is 8 cm. In case your roof includes a low slope (4:12 or 6:12) the mind lap must be 10cm.
Slate underlay ought to always be installed underneath the slates rather than on the top.
Slate roofs don’t need an ice and water membrane. If you are worried about ice-damming, double the amount decking felt across the eaves. You are able to spread roof cement between your layers while increasing the mind lap across the eaves to 13cm.
- Slate nailing
You need to get the nailing technique right or else you will damage the slates. Nails must only be driven to some depth in which the nail mind lies inside the counter-sunk nail hole crater. Doing the work properly will be sure that the nail heads won’t rub excessively from the overlying slates and put on an opening inside them.
Don’t over-nail or under-nail the slates. Over-nailing means the nail is driven too much and breaks with the slate, departing it hanging on a single nail or sliding out altogether. Once the nail is sticking from the nail hole this is whats called under-nailing.
You need to install flashings using the correct overlap or they’ll leak. Uphill flashing must always lap on the top of downhill flashing. Corner flashings, e.g. chimneys, must be either properly folded or soldered to avoid leakage.
Folded flashings may be used on positive slopes whereas soldered flashings are needed once the slope is really low the direction from the waterflow and drainage can’t be controlled by gravity alone. Soldered flashings should be installed with cleats or expansion joints to avoid stress on the solder joints. Never solder by having an open flame.
- Sides and ridges
Make certain the area slates meet tight in the roof hip and form an upright, weather tight, close-mitred junction or install ridge tiles laid to some true line using the edges and joints solidly bedded in mortar. Alternatively, you should use metal roll around the sides and ridges. Want to know more about copper flashing? Visit our website for more information.
Installing a slate roof maybe a little more difficult than installing other kinds of roofs. By using the recommendation above you greatly increase the likelihood of effectively installing a slate roof in your home.