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So far PiVi has created 1403 blog entries.

What is included in a complete roof, and how do you compare costs?

A complete roof is a system comprising the load-bearing structure, protective layers, covering, drainage and essential accessories, not just the sheets themselves. When comparing cost, it is therefore worth checking whether the offer includes all these elements and their mutual compatibility. The key decision variable is the scope of the entire system: from a structure capable of carrying all anticipated loads, through layers with appropriate diffusion resistance and unobstructed ventilation, to flashings and fixings. Only a full list of elements with quantities and units allows you to judge whether two similar amounts relate to a genuinely comparable scope.

By |2026-11-14T16:07:11+01:002026-10-30|Building guide|Comments Off on What is included in a complete roof, and how do you compare costs?
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How much does a sandwich panel cost and how do the different types compare?

Oborniki panel is a colloquial name for a sandwich panel. It does not describe a single core, dimension or quality standard. That is why the question about its price needs clarification. First define the application, panel type and required parameters. Only then compare the price per square metre, the cost of accessories and delivery. This way you avoid comparing incomparable materials. In commercial practice, the name covers various panels with facings and an insulating core. You may find wall, roof and cold-storage panels. The core may be made of PIR, mineral wool or another material specified in the documentation. Each variant requires a separate assessment. The traditional name alone gives no information about the parameters.

By |2026-11-14T12:16:28+01:002026-10-29|Building guide|Comments Off on How much does a sandwich panel cost and how do the different types compare?
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What determines the price per square metre of trapezoidal steel sheet?

The price per square metre of trapezoidal steel sheet depends on the profile, thickness, coating and unit of billing. The price list may show total m², covering m² and linear metres of sheet. The amounts must be standardised before comparison. Below we show a dated example of T18 and T35 prices and how to assess surcharges. This allows the price of the sheet itself to be separated from the cost of covering a specific roof or façade. Total square metre describes the area of the sheet in the adopted billing unit. Covering square metre takes into account the standard side lap. Linear metre, in turn, means a section of sheet one metre long and the width of the given profile. These units are not interchangeable without conversion.

By |2026-11-14T12:17:20+01:002026-10-29|Building guide|Comments Off on What determines the price per square metre of trapezoidal steel sheet?
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How much does tile-effect metal roofing cost and what are you paying for in the price per square metre?

The price of tile-effect metal roofing depends on the coating, steel thickness, format and method of calculating surface area. The amount per total square metre is not the same as the price per square metre of covering. The roof budget must also include cutting, flashings, accessories, delivery and installation. Below we show a real example of list prices from 28 October 2026 and explain how to use such data without confusing it with a ready-made quote. Total surface area covers the material in the entire sheet. Effective surface area defines the covering after accounting for standard overlaps. Both units may appear in price lists. The difference is not a discount or a surcharge. It results from how much sheet is involved in joining adjacent elements.

By |2026-11-14T09:53:40+01:002026-10-29|Building guide|Comments Off on How much does tile-effect metal roofing cost and what are you paying for in the price per square metre?
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How much does metal roofing cost for a roof area of 100 m²?

The cost of metal roofing for a 100 m² roof depends not only on the price per metre but also on the coverage width and the layout of the sheets. A profile that is cheaper per unit may require a larger purchase after cutting. We show this using a simple example of two roof slopes and catalogue prices from 28 October 2026. The calculation covers the sheets only. Flashings, fixings, delivery and installation require a separate schedule for the given building. Let us assume two rectangular slopes, each 10 m wide and 5 m long measured along the slope. Together they give 100 m² of coverage area. We assume sheets run the full length of each slope. There are no roof valleys or additional penetrations.

By |2026-11-14T12:17:18+01:002026-10-29|Building guide|Comments Off on How much does metal roofing cost for a roof area of 100 m²?
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T18 or T35 trapezoidal sheet: which profile suits the job?

The choice between T18 and T35 trapezoidal sheet depends on whether both profiles meet the requirements of the specific project. Compare sheet thickness, steel grade, cover width and support layout, and calculate the number of sheets, because a lower price per metre does not always give a proportionally cheaper covering after cutting. The designation indicates only the nominal profile height; it does not specify thickness, steel grade, support spacing or coating properties. Leave the load-bearing and deflection decision to the designer.

By |2026-11-14T16:06:36+01:002026-10-29|Building guide|Comments Off on T18 or T35 trapezoidal sheet: which profile suits the job?
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T18 and T35 trapezoidal roofing: price, sheet thickness and anti-condensation fleece

A T18 or T35 roof must be selected as a complete system. First, loads, supports and pitch are checked, then thickness, coating and sheet format. The anti-condensation layer can reduce dripping of condensate, but it does not replace insulation or ventilation. The price should include material after cutting as well as flashings, fixings and delivery. The following order helps prepare comparable quotes instead of choosing only the lowest rate. Determine the building's purpose and internal conditions. An open garage, a heated workshop and a hall with high moisture emission do not require an identical roof. Dimensions of the roof slopes, pitch, support spacing and location are needed. Snow, wind and the weight of planned layers and installations must be included in the design.

By |2026-11-14T12:16:09+01:002026-10-29|Building guide|Comments Off on T18 and T35 trapezoidal roofing: price, sheet thickness and anti-condensation fleece
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How long does it take to build a house, and how do you schedule the work?

A realistic schedule for building a brick house usually spans 12–18 months, but this is a starting point, not a guarantee. When comparing timelines, first check whether they cover only the works themselves or also the design and investment preparation — this determines whether you are comparing like with like. Also establish the final standard: shell, building with services, and a house ready for use are different stages. Describe them in contracts through a list of works, because the names alone are often understood differently. This way the deadline refers to a specific, verifiable result.

By |2026-11-14T16:07:56+01:002026-10-23|Building guide|Comments Off on How long does it take to build a house, and how do you schedule the work?
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Choosing galvanised, aluminium-zinc coated or prepainted steel for flashings

Choosing sheet metal for flashings should not begin and end with colour. Galvanised, Aluzinc and a coated surface represent different approaches to protecting steel. Each can have a justified application if it suits the conditions and the specific detail. It is worth understanding these differences before ordering ridge caps, barge boards or gutter aprons. This makes it easier to compare offers without creating a simple ranking from best to worst material. Galvanised sheets have a zinc layer on a steel substrate. It performs a protective function for the material underneath. The absence of coloured paint therefore does not mean the steel is left unprotected. The metallic appearance may suit buildings where a colour matched to the façade is not required.

By |2026-11-15T03:03:37+01:002026-10-18|Building guide|Comments Off on Choosing galvanised, aluminium-zinc coated or prepainted steel for flashings
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How do PIR boards compare with EPS, XPS and mineral wool?

PIR boards are worth considering where a small thickness must deliver high thermal resistance, for example in a loft or on a terrace. Check not only the lambda value but also the requirements for moisture, loads, acoustics and reaction to fire. Compare the data sheets of specific products, not generic material names. Bear in mind that PIR is not the same as a sandwich panel, and low water absorption does not replace waterproofing. Leave the design of the layer build-up to the designer.

By |2026-11-14T22:54:20+01:002026-10-18|Building guide|Comments Off on How do PIR boards compare with EPS, XPS and mineral wool?
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