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Choosing a flat roof covering and the layers beneath it

A flat roof needs a considered layer build-up, not just a single decision about the covering. The building owner and the trade should check whether the structural base, moisture control, thermal insulation and waterproofing form a coherent system, and whether the roof plan shows outlets and high points. The choice of PIR variant depends on the declared lambda and its compatibility with the membrane, not on the material name alone. The fall and its execution must suit the chosen system, so the drainage plan is developed together with the cross-section.

By |2026-11-14T19:18:42+01:002025-12-15|Building guide|Comments Off on Choosing a flat roof covering and the layers beneath it
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Tile-effect metal roofing or trapezoidal T18 or T35? What to choose for a house roof

Tile-effect metal roofing, T18 and T35 can be used on house roofs if they suit the design and installation conditions. They differ in appearance, geometry and method of cutting. A higher profile alone does not mean a better roof. The choice should be determined by roof pitch, support, full cost and aesthetic expectations. The comfort of the attic, however, depends on the entire layer system, not just the shape of the outer sheet. Tile-effect metal roofing has transverse ribs that divide the surface into rows resembling roof tiles. Trapezoidal steel sheet forms a simpler pattern of long, parallel ribs. T18 gives a finer pattern than T35. The profile height affects the shadow, so the same colour may look different on each of these coverings.

By |2026-11-14T09:53:47+01:002025-12-12|Building guide|Comments Off on Tile-effect metal roofing or trapezoidal T18 or T35? What to choose for a house roof
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How to choose the thickness of an insulated roof panel for a garage?

The garage roof is selected according to heating, moisture and loads. There is no single panel thickness suitable for every building. An unheated garage, a workshop and a room connected to the house place different demands. In addition to thermal insulation, supports, slope, seals and ventilation are important. A thinner panel may be sufficient in one project and unsuitable in another. This is the first question before choosing a thickness. In a continuously heated garage, limiting heat loss matters. In an unheated one, insulation slows temperature changes but does not by itself ensure a positive temperature throughout the winter. The required effect should be described without assuming that the material will replace a heat source.

By |2026-11-14T12:17:59+01:002025-12-12|Building guide|Comments Off on How to choose the thickness of an insulated roof panel for a garage?
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A heated workshop with fibre cement roofing: the roof build-up and working comfort

In a workshop, a stable working environment matters, not just sheltering tools from the rain. Heating, wet vehicles and running equipment create conditions different from an open carport. Fibre cement sheets can be the covering of such a building, but comfort requires a complete layer build-up. Asbestos-free fibre cement is not a thermal solution on its own. Before buying, it is worth defining the working temperature, operating hours, sources of moisture and the services required. A workshop used daily and a room heated for a few hours react differently. With intermittent heating, the structure and covering may remain cold while the air inside warms up quickly. If it contains a lot of moisture, the importance of a correct layer build-up and ventilation increases.

By |2026-11-15T17:56:41+01:002025-11-25|Building guide|Comments Off on A heated workshop with fibre cement roofing: the roof build-up and working comfort
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Insulating a wall plate where the roof meets the wall

Insulating the wall plate must be considered together with the whole junction where timber, the ring beam, the eaves and the roof layers meet. Above all, check whether the roof-slope insulation actually connects to the wall layer rather than merely sitting next to it on a drawing. The article compares mineral wool and PIR boards, discusses eaves ventilation and the sequence of work on an existing detail. Material choice depends on the available space and the adopted layer arrangement, so the structural decision is left to the designer.

By |2026-11-14T22:52:58+01:002025-11-19|Building guide|Comments Off on Insulating a wall plate where the roof meets the wall
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Fibre cement roofing above an insulated loft: layers and junctions

A covering over a habitable loft must work together with the layers that provide warmth, dryness and comfort. A durable outer surface alone is not enough. Fibre cement sheets can be included in such a roof if the whole solution meets the building's requirements. Asbestos-free fibre cement acts here as the covering, not as a ready-made insulated panel. The junctions between layers at walls, windows and service penetrations require the most attention. The insulation may be located in the roof slope or in the ceiling separating an unused space. These are different arrangements. If the loft is to be habitable, the thermal envelope should encompass all used parts. Knee walls, slopes and junctions with the ceiling must be checked.

By |2026-11-15T17:56:38+01:002025-11-16|Building guide|Comments Off on Fibre cement roofing above an insulated loft: layers and junctions
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Preventing roof leaks during installation

Roof tightness depends primarily on roof pitch, the quality of joints and the way water is drained, not on the sheet metal alone. Check the specified pitch against the installation instructions for the selected covering. T18, T35 and tile-effect sheets need not share the same limits. It is also worth tracing the entire water path from ridge to eaves, checking the choice of underlay and planning flashings at the chimney and service penetrations. The key decision concerns the compatibility of the covering with the roof geometry and fixing system, not the number of sealants.

By |2026-11-14T19:21:59+01:002025-11-16|Building guide|Comments Off on Preventing roof leaks during installation
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PIR roof panel or EPS-core panel? How to compare the options

A PIR roof panel usually achieves better thermal insulation at a smaller thickness than a comparable EPS-core panel. The polystyrene variant can be cost-effective and lightweight. However, the choice should be governed by the requirements of the entire roof. U-value, loads, the range of fire classifications, coatings and installation cost must be compared. The same thickness does not mean the same thermal function. An insulated roof panel has metal facings and a bonded core. Its price should not be compared directly with a PIR insulation board alone or a pack of EPS. These materials require other layers to form a roof. In both panel variants, the outer profile and the joints are part of the roofing system.

By |2026-11-14T12:18:14+01:002025-10-24|Building guide|Comments Off on PIR roof panel or EPS-core panel? How to compare the options
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Roofs without overhanging eaves: what to plan before building

A roof without eaves is one where the edge of the slope sits close to or flush with the façade rather than projecting beyond it. Before building, it is worth establishing how water will drain away and where the service points will be. Check the junction detail between roof and wall, the continuity of insulation, and access to the gutter and downpipe. Whether the gutter stays visible or is concealed depends on the chosen detail. Also remember ventilation and the coordination of roofing, insulation and façade work.

By |2026-11-14T22:52:53+01:002025-10-21|Building guide|Comments Off on Roofs without overhanging eaves: what to plan before building
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Planning integrated photovoltaics for a hipped roof

A hipped roof can be combined with integrated photovoltaics, but its shape requires careful planning. Triangular and trapezoidal slopes cannot accommodate rectangular modules in the same way as a large gable roof. In steel BIPV, active zones can be combined with passive cladding. This allows a consistent appearance to be maintained even at the edges. However, the design should be based on the actual dimensions, orientations and energy requirements of the house. Each slope tapers in a specific way, and the corners form long diagonal lines. The area measured in square metres does not show how many full active modules can be accommodated. It is worth preparing a separate drawing for each side.

By |2026-11-15T17:55:44+01:002025-10-12|Building guide|Comments Off on Planning integrated photovoltaics for a hipped roof
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