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So far PiVi has created 1403 blog entries.

PIR beneath a roof membrane: specifying the facing and adhesive

Matching thickness is not enough when substituting PIR on a flat roof. If the membrane will be bonded, the installer needs to know which surface it will adhere to. Even boards sold under similar names can have different facings. Start with a drawing: label both sides of the board, the layers touching them and how each joint is made. You can then check the instructions for that combination and identify gaps in the quote. This is particularly useful for a partial roof repair where the new build-up meets existing waterproofing.

By |2026-11-09T11:15:21+01:002026-11-09|Uncategorized|Comments Off on PIR beneath a roof membrane: specifying the facing and adhesive
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Coated trapezoidal sheet: specifying protection for both faces

When choosing coated trapezoidal sheet, describe the conditions on each side. Sun, rain and airborne dirt act on the outer face of a roof. The underside may be in a dry warehouse, a damp garage or a room that is washed regularly. Sheets of the same colour need not provide the same protection in all three settings. Tell the supplier how the building is used, what moisture is expected and how it will be cleaned. Compare the coating specifications for both faces and include the selected finish code in the order. This helps with checking the delivery and choosing compatible flashings and repair materials.

By |2026-11-09T10:42:08+01:002026-11-09|Uncategorized|Comments Off on Coated trapezoidal sheet: specifying protection for both faces
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Insulating a wall plinth beside an existing driveway

Before insulating a plinth, look at the junction between the wall and the driveway. Mark the paving level, the direction of rainwater runoff and any places where water lingers against the wall. A section showing these features helps establish where the insulation will sit, what it will touch and how its exposed edge will be protected. Even a short stretch beside a garage door can need a different finish from the adjoining wall facing the garden.

By |2026-11-09T11:52:04+01:002026-11-09|Uncategorized|Comments Off on Insulating a wall plinth beside an existing driveway
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Sandwich panel walls in a wash-down room. How to specify the lining

In a room that is washed down regularly, start the wall panel specification with the person responsible for cleaning. List the cleaning products, methods of application and areas reached by water. The supplier can then assess the particular internal coating. Agree floor junctions, corners and pipe details with the installer at the same time. Water can collect there after cleaning, and an exposed edge can easily be overlooked. Use the points below to prepare the order and plan the first clean of the finished wall.

By |2026-11-09T12:26:19+01:002026-11-09|Uncategorized|Comments Off on Sandwich panel walls in a wash-down room. How to specify the lining
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How to assess a trial clean on a livestock building ceiling

A trial clean on a barn ceiling raises two questions. Does the dry surface look as expected, and which other panels does the result apply to? Choose a patch on a known facing, leave a similarly soiled area beside it for comparison and record both before cleaning begins. Once dry, view them again from the same position. The example below shows how to document a trial in the middle of a panel and decide where to stop if the ceiling differs at the wall or in a later extension.

By |2026-11-09T14:03:20+01:002026-11-09|Uncategorized|Comments Off on How to assess a trial clean on a livestock building ceiling
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Core conductivity or panel U-value? Checking a quotation for a hall wall

A hall specification calls for a particular U-value, but the sandwich panel quotation gives only the conductivity of the PIR core. The figures cannot be compared directly. One describes heat transfer through a specified element; the other is a material property. Look up the manufacturer’s U-value for the wall panel model and thickness being offered, then check whether the design requirement applies to the panel or to the complete wall with its junctions. Here is how to put those figures side by side and recognise when the quotation still leaves a question unanswered.

By |2026-11-09T14:50:24+01:002026-11-09|Uncategorized|Comments Off on Core conductivity or panel U-value? Checking a quotation for a hall wall
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Announcements are hard to hear under a grandstand roof. How do you specify the acoustic treatment?

Under a grandstand canopy, the word “noise” can describe several different problems. Rain strikes the roof covering, a loudspeaker announcement reflects from the soffit, or the crowd masks the words in particular rows. Each calls for a different check before roof sheeting or an additional lining is selected. Start by marking where listeners lose individual words and recording the conditions under which it happens. An acoustician can use those observations to decide which features of the canopy, loudspeaker layout and surroundings to include in the design.

By |2026-11-09T15:45:03+01:002026-11-09|Uncategorized|Comments Off on Announcements are hard to hear under a grandstand roof. How do you specify the acoustic treatment?
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Attic insulation: measuring slopes, openings and separate insulation zones

The floor area of an attic is not automatically the roof insulation area. Before ordering PIR, EPS, XPS or mineral wool, identify the elements covered by the design and the products specified for each location. Slopes, horizontal ceiling sections and walls may form separate zones with different thicknesses and installation arrangements. Measurements should show the geometry of each zone, openings and interruptions in the layer. This guide explains how to prepare an understandable area schedule, distinguish geometric quantities from order quantities and avoid errors when handing over measurements. The numerical example calculates area only; it does not specify insulation thickness or make any material suitable for a roof slope.

By |2026-11-09T16:40:48+01:002026-11-09|Uncategorized|Comments Off on Attic insulation: measuring slopes, openings and separate insulation zones
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Façade insulation costs: agree the measurements, quotation scope and additional work

Façade insulation costs become comparable only when the area and scope behind each price are clear. The same house may be described using wall areas including openings, areas after deducting openings, or several separately measured tasks. None of these figures defines a complete order without explanation. This guide moves from an elevation sketch to a usable comparison: identifying openings and reveals, separating purchased material from completed work, and recording items requiring site verification. It also covers documenting scope changes. It does not prescribe a universal price per square metre or a mandatory measurement method. The aim is an agreed, understandable basis for discussing a quotation with the contractor.

By |2026-11-09T17:29:07+01:002026-11-09|Uncategorized|Comments Off on Façade insulation costs: agree the measurements, quotation scope and additional work
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Sandwich panel flashings and details: preparing a complete package

Sandwich panel cladding requires agreement on places where panels end, change direction or meet other building components. At these locations, a panel list alone no longer describes the complete order. Flashings, fixings and sealing materials need to be linked to the relevant details rather than selected solely by colour. This guide creates a map of those interfaces, gives them identifiers and moves from drawings to an accessory schedule. It also examines responsibility at windows, doors and service penetrations. It does not prescribe a universal flashing shape or sealing method: the solution must suit the particular panel, the enclosure's function and the project documentation.

By |2026-11-09T18:42:56+01:002026-11-09|Uncategorized|Comments Off on Sandwich panel flashings and details: preparing a complete package
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