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Fixing through the crest of the corrugation. The rule you need to check in the installation instructions

The position of the fastener affects the weathertightness and the way the covering performs. It is not chosen where it is easiest to reach with a tool. Fibre cement sheets are fixed according to the pattern specified for the product. In many roof systems the holes lie on the crests of designated corrugations. Asbestos-free fibre cement should not, however, be installed on the basis of this general rule alone. The support, the position of the hole and the required sealing set must also be determined. The valley of the corrugation directs water down the slope. The crest is a different location in terms of geometry and run-off. The fixing system uses this difference but requires proper sealing of the penetration. Placing the screw high up alone does not guarantee weathertightness.

By |2026-11-15T17:20:37+01:002026-03-25|Technology and applications|Comments Off on Fixing through the crest of the corrugation. The rule you need to check in the installation instructions
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Comparing wall and roof panel prices in a single order

The price of a wall insulated panel and a roof insulated panel should be compared within a specific order. The profile, facings, core and connection details differ. The square metre alone does not describe the entire expense. First count the elements for both surfaces, then add flashings, fixings, transport and unloading. Prepare separate lists for the walls and the roof. On each, record the panel type, core, thickness, sheet parameters and coating. State the thermal requirements and other properties adopted in the project. The same core thickness does not make a wall panel and a roof panel equivalent items. Their geometry and method of use are different.

By |2026-11-14T15:39:23+01:002026-03-24|Technology and applications|Comments Off on Comparing wall and roof panel prices in a single order
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What are the advantages of small modular roof sheets?

Small modules of tile-effect metal roofing make it easier to transport to site, to pass up onto the roof and to plan work on a complex roof slope. In some layouts they help to reduce waste. This does not, however, mean that there are no cuts or that the whole roof is automatically cheaper. The benefit depends on the geometry, the method of laying and the organisation of installation. It is worth comparing small sheets with a format cut to size for the specific project. A module is a repeating section of the profile, and a sheet may comprise one or more such sections. Trade names are sometimes used inconsistently, so actual dimensions should be checked. The overall length of the sheet differs from the cover length, because part of the material forms the joint.

By |2026-11-14T15:40:51+01:002026-03-18|Technology and applications|Comments Off on What are the advantages of small modular roof sheets?
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How to keep insulation continuous around a wall plate

Insulating the wall-plate zone requires a separate detail that connects the wall insulation with the roof insulation, covering the ring beam, the slope and the airtight layer from the inside. It is worth checking on the section whether the insulation layer does not end at the ring beam without connecting to the next insulation, and whether the intended ventilation under the covering has been left. The thickness and routing of the insulation are determined with regard to the structure and moisture; where space is limited, PIR boards may be considered, matched to the whole assembly.

By |2026-11-14T22:26:44+01:002026-03-09|Technology and applications|Comments Off on How to keep insulation continuous around a wall plate
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Four things to check before ordering tile-effect metal roofing

Start with the pitch, batten spacing and details at valleys, roof windows and chimneys. A tile-effect sheet has a minimum pitch specific to its profile. Check how the detail works across the entire roof, particularly where several slopes meet. The existing battens may be at the wrong centres for the steps pressed into a new sheet. Use the installation instructions to establish the required spacing and allow for any alterations in the estimate. When replacing a covering, check the condition of the rafters even if the new sheets are light.

By |2026-11-15T02:34:47+01:002026-03-04|Technology and applications|Comments Off on Four things to check before ordering tile-effect metal roofing
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Sizing gutters for a metal roof

Gutters for a roof covered with sheet metal are selected primarily according to the volume of water to be drained and the layout of the roof slopes. Colour and shape come next. You need the dimensions of the catchment areas, the length of the runs and a plan for the arrangement of the outlets. The gutter and the downpipe must form a compatible set. Even a large cross-section will not help if the water does not reach the gutter or if the rest of the system is blocked. It is worth planning the entire rainwater path through to the receiver. First mark on the plan which eaves the water flows to from the individual roof slopes. A simple gable roof usually divides the runoff between two sides. With dormers and roof valleys the layout can be more complex.

By |2026-11-14T15:41:47+01:002026-02-27|Technology and applications|Comments Off on Sizing gutters for a metal roof
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Where does a leak in a metal roof come from and how can you narrow down the location of the fault?

A wet patch under the roof does not always indicate the location of the leak. Water can travel along the underside of a sheet, a batten or a membrane. It is worth first linking the trace to the weather and the geometry of the roof slope. This order makes it easier to find the cause. It also reduces the risk of accidentally sealing joints that are working properly. Note when you notice the damp. Has it rained? From which direction was the wind blowing? Does the patch grow after prolonged rainfall or after a short downpour? A dated photo and a simple sketch of the room help more than a general statement that the roof sometimes leaks.

By |2026-11-14T09:23:45+01:002026-02-25|Technology and applications|Comments Off on Where does a leak in a metal roof come from and how can you narrow down the location of the fault?
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How do seven purchasing decisions change the cost of sandwich panels?

The invoice for panels is influenced by much more than the rate per metre. Building dimensions, required parameters and the method of delivering the elements all matter. It is worth separating seven decisions that can be checked before ordering. This allows savings to be found without accidentally worsening the finished enclosure. A wall 10.2 m wide and 3 m high has 30.6 m². With a 1 m module, eleven strips are needed before cutting, i.e. 33 m². The difference is 2.4 m². This is a simplified example, without openings and corners, but it clearly shows the impact of final cutting.

By |2026-11-14T12:00:09+01:002026-02-22|Technology and applications|Comments Off on How do seven purchasing decisions change the cost of sandwich panels?
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What is a wall plate and how does it support the roof?

The wall plate is a timber element at the top edge of the wall on which part of the roof structure bears. It helps transfer loads and forms the connection point between the rafters and the building. Its cross-section, anchorage and bearing details are determined by the design. Equally important is the junction between the wall insulation and the roof slope insulation, because it is easy to leave an airtightness gap and a cold spot in the building envelope at the wall plate. The wall plate is most often laid along the external wall at the point where the rafters bear. It is part of the structural system, not merely a convenient mounting batten. It receives the forces transmitted by the roof and passes them to the supports. The forces that occur depend on the truss arrangement, the loads and the geometry of the connection to the rafter.

By |2026-11-14T15:39:55+01:002026-02-21|Technology and applications|Comments Off on What is a wall plate and how does it support the roof?
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What work does a roofer carry out?

The roofer installs the layers and details that drain water and protect the building interior. They lay the covering, prepare flashings and install drainage within the agreed scope. A good result requires collaboration with the carpenter and the designer. Before commissioning the works, establish exactly what the service includes, which materials will be used and how you will accept the finished roof. The scope usually includes the underlay, the substructure for the covering, installation of the sheet metal and execution of flashings. Gutters, ventilation elements and roof accessories may be added. Not every quote includes all these items. Removal of the old roof, repair of the structure and insulation are often separate works.

By |2026-11-14T15:39:43+01:002026-02-19|Technology and applications|Comments Off on What work does a roofer carry out?
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