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About to start a roofing project, but not sure what type of roofing is right for your project? Then read our guide to find the answer.
There are four different types of felt roofing:
Each type has its advantages and disadvantages, most notably is the fact that some types of felt are useable on habitable environments and others are not! This is a very important point, because if you buy the wrong type you could be putting your home and yourself at risk.
Roofing felts are split into two categories, habitable and non-habitable.
Shed Felt is the ideal product for waterproofing a variety of garden buildings, including sheds, summerhouses, kennels and hutches.
This two-layer system (based on using underlay and top sheet) is ideally suited as a weatherproofing material for the roofs of garages and larger non-habitable outbuildings with a 5 degree pitch or more.
Traditional Felt offers: Long lasting weatherproofing, suitable for non-habitable buildings and garages.
Long-term 2 layer system for weatherproofing and protection- vs Shed Felt shorter term- single layer system so lasts twice as long.
The Torch-On System incorporates an underlay and a Capsheet, and offers high performance waterproofing for habitable buildings.
Easy Seal is a 2 layer self adhesive system that is safe to apply and lasts up to 20 years
Where used as a single layer on a shed roof, the minimum pitch of the roof should be 20 degrees. Shed Felt should be clout nail fixed with the laps fully sealed using a suitable cold adhesive such as Trowelable Roofing Felt Adhesive.
Quick drying roof primer should be used to prepare the roof surface. Roofing Felt Adhesive can then be used to bond both the Underlay and Capsheet.
Quick Drying Roof Primer should be used to prepare the roof surface. Torch-On membranes must not be directly torched onto combustible substrates. For these projects the use of a Traditional Felt Underlay is recommended which can also be nailed down using clout nails. Alternatively you can use a self-adhesive layer such as Easy Seal Underlay.
Easy Seal Primer should be used to prepare the roof surface. Then use the easy seals self adhesive to stick it down. Then Lap Mastic is used to seal end laps and gutter/drip edges.
Below we will go through some of the accessories needed when fitting felt, as well as what tools may be needed.
This is deep penetrating bituminous solution for stabilising dusty and porous surfaces prior to the application of roofing felt systems. When used in conjunction with Roofing Felt Adhesive, the bond between the roof and the waterproofing material being applied is significantly improved, ensuring a long term, watertight finish. This product can be used with Traditional and Shed Felts.
A general purpose bitumen adhesive to seal overlaps on roofing felt and shingles for traditional and shed felts.
A thick, fast drying, cold-applied bitumen adhesive which enables total bonding of roofing felts without the need for hot bitumen or flames. Specially formulated for immediate and workable felt application, it is also ideal for sealing lap joints and for fixing chippings to the final layer of a built-up roofing system.
A brush applied, solvent-based felt adhesive that is suitable for bonding all types of roofing felt.
The galvanised clout nails are great for nailing felt down. If you are fitting felt to a shed, the recommended length would be 20mm.
There are 3 different types of roofing sheets:
Each type of sheet roofing can be used on a different structure or project, so it is a good idea to know which is best for what job
These roofing sheets can be used on a variety of projects, but it is best to get the correct sheet for the correct project. Let's have a look at where they can be applied.
The sheets can be laid onto a roof structure of rafters and purlins or onto sheet decking. If the roof structure is not perfectly even, this will not create problems since the sheets are, to an extent, flexible and will withstand some bending to accommodate slight variations in levels. They can also be used as a vertical wall cladding, ideally suited for sheds and other out buildings.
PVCu Corrugated Roofing Sheet is very light in weight, simple to use and has high impact strength. There are two corrugation profiles – Standard and Mini, both of these have a high light transmission and are resistant to yellowing. The standard corrugated roofing sheets are compatible with corrugates of alternative materials such as bitumen and steel, however the mini corrugated roof sheets are often ideal for smaller buildings as it’s often considered more aesthetically pleasing.
Corrugated bitumen sheets are suitable for non habitable buildings, however they are unsuitable for habitable buildings.
They can be used on:
First mark out the line of the cut in the base of the sheet corrugation, then use a roofers knife to score the corrugated bitumen sheet. Next fold back the sheet along the cut / scored line to separate the cut sections of the sheet.
It is massively important that you fit a bitumen sheet correctly, if you don’t and the roof starts collecting water it will sag and sink in the middle. This will allow water to pour through which can be disastrous.
Below you will see the guide for the nailing pattern on a bitumen roof.
Below you will see the guide for working out the pitch and then best way to fit the bitumen roof according to the pitch.
Although used chiefly as a conservatory roofing sheet along with special fixing profiles and glazing bars, the sheeting is also suitable for a variety of other applications such as glazing and insulating greenhouses, for glazing porches, for carport roofs, and for roofing sheds or workshops to allow daylight in. It also has uses as a mini greenhouse.
As one of the toughest plastics known to man, polycarbonate is rapidly proving itself to be an excellent material for roofing purposes. In its twinwall and triplewall sheet form, it is the perfect replacement for wired glass, or corrugated sheeting.
Polycarbonate, despite its strength, can be cut using a fine toothed panel saw. When cutting to width you should endeavour to cut close to the outside of one of the internal walls as in Diagram D.
For each of the sheet roofing, there is a specific way to fix it to your roof, below we will go through each sheet and what fixings they require.
PVCu corrugated fixings are to be installed on the ridge of the corrugation not in the trough to prevent leaking. For fixing the PVCu Corrugated Sheets only. Mini profile fixings should be installed on the ridge of the corrugation and not in the trough to prevent leaks. They’re for fixing mini profile corrugated sheets only and have a translucent integrated cap for a smooth finish.
Other products to be used in this project are Eaves Fillers which can be used to seal your roof, and keep out draughts and insects.
Using the Profile sheeting nails to fix the bitumen sheets, simply nail through the washer and top of the sheet corrugation and clip the washer into place.
They securely fix polycarbonate sheets to a wooden sub-structure.
Other products to be used in this project include Glazing Bars to help fix the roofing sheets, End Caps to provide a neat gable end to your project, Edge Flashing to provide a neat finish to the sides of the polycabonate roofing, and Anti Dust Tape to seal cut ends.
There are 2 different types of liquid roofing which are repair and protection.
Each has their own features and benefits which we will explore now
The 3 products below are temporary solutions and they can be applied in damp conditions, are ideal for pooling and can be applied in one coat.
Acrypol + Waterproof Coating is a tough, seamless, flexible layer for repairing light damage to roofs.
Available in black and grey 1kg tins but also 5kg in Grey.
For emergency roof leaks that require immediate repair
Its special formulation allows the product to be applied in wet weather, providing an instant leak solution. The product is extremely tough and durable.
All Weather Roof Repair Mastic has been specially formulated to stop leaks in roofs and gutters in emergency situations, even under the most severe weather conditions.
Quick Seal is a spray-applied mastic, formulated to provide rapid sealing of water leaks on most surfaces, even when damp.
For newly laid roofing felt in need of protection, damaged roofing in need of repair and protection and weathered flat roofs. Plus it gives 10 years of weatherproofing protection.
Thompson’s one coat roof seal gives newly laid roofing felt protection. It can also be used on damaged roofing needing repair and protection as well as on weathered flat roofs. This product gives 10 years of weatherproofing protection and will protect and weatherproof flat roofs in one coat.
These come in two versions with a solvent free option and are brush applied
A high-performance, instant roof repair compound, ideal for emergency repairs or general maintenance.
A solvent-free waterproofer suitable for most roofing surfaces and provides a protective coating for wood, metal and cement.
Below we are going to cover some of the necessary tools for the job, and what tools are needed for which specific liquid roofing technique.
When it comes to solvent liquids the main tools needed are brushes and rollers, but because of the different ranges of solvent liquids there are some other tools that could help you out.
It is a good idea to get multiple tools, especially of the brushes, soft brooms and rollers, because they will need cleaning with white spirit. If you initially get 2 of each tool you shouldn’t have to pop out mid job to get more. Please check that the rollers and brushes are suitable to use with solvent based products.