Roof valleys are a recurrent source of leaks in more mature homes. Installation treatments vary based on the roof style and products used. We will look right here at the simple installation of an open lead lined roof valley.
A roof valley is generally a gutter established between two conference pitched roofs. Based on the roof spot it serves, the valley is the exit position for a massive volume of drinking water so extraordinary treatment ought to be taken with installation. If the roof has been leaking for a although or if there are any indications of rot, you will have to have to start out by changing the valley boards. Guide sheet is not self supporting and ought to be positioned on taken care of roofing boards of enough energy to maintain a massive human being. (Most roofing contractors are major men!) Fit boards of enough width to accommodate the lead plus 100mm either aspect. This will give you a thing to nail the roofing batons to.
The prime of the valley boards ought to be at the exact same level as the prime of the roof rafters. If you lay the boards instantly on prime of the rafters it may result in the roofing tiles to kick up and prohibit drinking water run off. You will have to have to minimize the valley boards to in good shape in between the rafters. Support the valley boards with studs or noggins. The valley ought to complete on an even airplane at the eaves. It ought to not kick up better than the bottom rafters. If it does, you will have to have to minimize the fascia board or regulate the gutter to suit. It is a superior plan to in good shape a tilting fillet just about every aspect of the valley. This angled strip of wooden runs alongside the valley duration and ought to be a minimum amount of 150mm from the centre of the valley. It ought to sit no better than the roofing batons with the thinnest close closest to the centre of the valley.
It is prevalent follow to in good shape a single sheet of roofing underlay the complete duration of the valley. The adjacent roofing underlay will rest on prime of this sheet. I endorse you use 1 of the new state-of-the-art artificial underlay products. The more mature bitumen based mostly felts are wonderful for usual roofing scenarios but are not ideal for valleys. More than time the bitumen will bond the lead to the boards and prohibit thermal motion. You ought to make certain you obtain lead of a enough grade/code for valley programs. This ought to be between one.80mm and 2.24mm thickness. If you are uncertain request your roofing merchant of the suitable grade. The lead ought to be minimize into sections no larger sized than one.five meters in duration to let enough thermal motion. Bend a welt into the lead 25mm just about every aspect. This functions as a past line of defence for drinking water penetration. It also has the additional reward of stiffening the lead, which can make carrying it up the roof a lot less complicated.
Setting up at the bottom of the valley, gown the lead neatly on to the valley boards and around the tilting fillets. The bottom of the lead ought to let suitable drainage into the gutter. Deal with two rows of nails at the really prime of the flashing. Use copper or stainless metal nails. Never ever use galvanised or aluminum nails which will just respond with the lead and corrode. I endorse you use the minimum amount amount of fixing achievable to maintain the lead in position. If you around resolve lead sheeting it will sooner or later split because of to thermal motion. So will not nail the sides. When you have effectively dressed the 1st sheet you can go up the roof laying subsequent sheets. Overlap just about every sheet a minimum amount of 150mm. On lower pitched roof valleys you will have to have to increase the lap. Wherever the valley ends at the ridge, you will have to have to gown the lead so it can sit neatly beneath the ridge tiles. You are now prepared to start out fixing the batons and laying the roofing tiles. The essential factors to bear in mind are to hold the sheet lengths down to one.five meters and will not around resolve. If you comply with the method outlined and choose treatment with the dressing you will produce a tough maintenance cost-free valley.