Intelligent, effective solutions for joints (8/8) – Old floor joists in refurbishment projects

Continuation of Part 7: Particular challenges on refurbishment projects

Old floor joists in refurbishment projects /penetrations of masonry/joists

Typical leaks can be found at the joist bearings of timber roof joists in the masonry structure. The bricks between the joists are generally not plastered. On refurbishment projects, joints with the old masonry can lead to leaks; on new buildings, non-mortared butt joints between bricks can cause leaks. Even if a layer of plaster has been applied, airtight joints to the joists are generally neglected. This is indicated by air currents through the joints between old wooden floorboards detected during blower door tests.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Intelligent, effective solutions for joints (7/8) – Particular challenges on refurbishment projects

Continuation of Part 6: Problem with skylights: adhesive bonds at corners

Airtightness on refurbishment projects is particularly challenging, as uneven subsurfaces and walls that are not straight are commonly encountered. These are often covered over with a lightweight wall made of plasterboard to create a clean, even new surface in refurbishment situations. However, non-sealed elements such as unplastered masonry in the building envelope are generally not taken care of first.

Air flow is possible behind structures of this type, and these structures need to be improved. The rule of thumb here is: applying coatings is better than fitting cladding over these surfaces. It is sufficient to apply a smooth plaster finish to unplastered or porous masonry areas in order to prevent the flow of air. Alternatively, a sprayable plastic sealant can be applied to the surface. To achieve more reliable results, blower door testing during construction can identify weaknesses in this regard at an early stage.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Intelligent, effective solutions for joints (6/8) – Problem with skylights: adhesive bonds at corners

Continuation of Part 5: Care required at the corners of plastic windows:

A challenging corner joint arises when installing skylights. The membrane is guided up to the surrounding window profile all around the window and has to be stuck there in a reliable, sealed manner, even at the corners. Particular care must be taken at the corners. An experienced tradesperson can achieve an uninterrupted airtight seal here using prefolded adhesive tapes. Prefabricated corners, which may be adapted for the width of the surrounding window profile that is present if necessary, are a reliable alternative.

The corners of skylights always show up first in blower door tests. It is important to start by sealing the corner and then to seal the surrounding window profile all around the window. This challenge can be solved by installation tradespeople by folding adhesive tape to create a corner element.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Intelligent, effective solutions for joints (5/8) – Care required at the corners of plastic windows:

Continuation of Part 4: The challenge: pipe feed-throughs

The position of the airtight layer must be defined

Leaks at windows. Photo: ‘Zieht wie Hechtsupp’ – the construction portal for leaks, damage to structures and other curiosities.

Plastic windows are commonly used in practice on our building sites, but are often associated with a lot of leaks. This is why providers of blower door measurements like to test the joints around these windows. The reason for this is that air can flow freely in the surrounding window profile. The installation guidelines of the RAL quality seal for windows and doors specifies the closing of surrounding window profiles with a special profile – but this is rarely done in everyday practice. However, these air flows can be interrupted by using some joint adhesive.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Intelligent, effective solutions for joints (4/8) – The challenge: pipe feed-throughs

Continuation of Part 3: The challenge: cables passing underneath joists

The number of pipe feed-throughs through airtight layers is increasing continuously. The familiar vent pipe for the sanitary drain pipe is no longer the only candidate by any means! However, installation technicians for domestic hot water heating, photovoltaic systems and ventilation systems often show little consideration for this issue. Damage can be avoided by careful planning and early intervention. A lot of prefabricated solutions are now available that can be implemented quickly and cost-effectively.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Intelligent, effective solutions for joints (3/8) – The challenge: cables passing underneath joists

Continuation of Part 2: The challenge: sealing cable looms

Kabelbaum über Unterzug abdichten
It is recommended to create a cable tunnel in the case of middle purlins or joists where cables come out on the other side.

If cable bundles pass though interior walls, middle purlins or joists and thus penetrate the airtight layer twice, the cables need to be stuck in an airtight manner on both sides. An alternate solution is to create a cable tunnel using prefabricated shaped elements or a box made from airtight wood-based panels. The amount of work involved in this case is significantly lower and the end result is better.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Intelligent, effective solutions for joints (2/8) – The challenge: sealing cable looms

Continuation of Part 1: Typical leaks: cable feed-throughs for electrical installations

Penetration by single cables and pipes is relatively easy to solve. If adhesive tape is being used, the following steps have proven themselves in practice: first stick the adhesive tape to the cable, and then to the airtight membrane so that an L-shaped adhesive bond with both sides is formed. If more conduits or cables penetrate the airtight layer, the work needed to create an adhesive joint using adhesive tape or adhesive from a tube will be more laborious. Another disadvantage is that the adhesive comes apart as soon as you pull on it.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Intelligent, effective solutions for joints (1/8) – typical leaks: cable feed-throughs for electrical installations

Properly installed air sealing is the basis for energy-efficient buildings that are protected against damage to structures. In addition, planners and tradespeople are liable for any damage that may occur later in the case of flawed planning and installation. Blower door tests during the construction phase and after completion show whether the values demanded by regulations and standards (German Energy Saving Ordinance, DIN standards) are achieved in practice. These tests also show where leaks are present in the building envelope.

This series of articles summarises typical, challenging joint situations and shows how technicians can find practical solutions for these challenges. It also provides an overview of the detail features for which prefabricated solutions are available that allow tradespeople to achieve airtightness in a quick, easy and reliable manner.

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Solutions for sealing all windows – Humidity-variable and full-surface adhesive: the new window sealing tape from pro clima

Simple window installation with CONTEGA SOLIDO IQ

It can be used on the interior or exterior, transports undesirable moisture out of window joints and is full-surface adhesive. The new joint adhesive tape from pro clima – CONTEGA SOLIDO IQ – will make the installation of windows easier and will provide protection against damage to structures. When installed on the inside, it is vapour-retarding and airtight; when used on the outside, it is resistant to driving rain, open to diffusion and windtight.

Window sealing tape Contega Solido IQ
Simplifies stock management and helps to prevent installation errors: CONTEGA SOLIDO IQ. The intelligent window joint adhesive tape for interior and exterior use.
Installation window sealing tape Contega Solido IQ
Full-surface adhesive, intelligent window sealing tape for interior and exterior use. New from pro clima: CONTEGA SOLIDO IQ.

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Independent, national technical approval, European: 
The INTELLO humidity-variable vapour retarder system has been awarded ETA approval

European Technical Assessment confirms high durability even under demanding conditions, as well as compatibility with DIN 68000-2

Long-term durability, even subject to extreme heat or cold: pro clima’s INTELLO and INTELLO PLUS airtight membranes are humidity-variable and very resilient. This has now been confirmed by independent technical testing by the German Institute for Construction Technology (DIBt).

“Our humidity-variable INTELLO and INTELLO PLUS vapour retarders, together with our DB+ product, were the first humidity-variable vapour retarders to receive national technical approval from the German Institute for Construction Technology (DIBt). These products have now been awarded approval in the European Technical Assessment (ETA). As a result, they now also have the required proof of durability demanded by DIN 68000-2 for vapour retarders with humidity-variable diffusion resistance,”

ays carpenter and construction engineer Michael Förster, head of Application Technology at pro clima.
Sicherheit in der Konstruktion Luftdichtungssystem INTELLO
Humidity-variable vapour retarder and airtight membranes. INTELLO – The high-performance system from pro clima for maximum reliability. Even on structures with demanding engineering conditions.

Advantages of humidity-variable vapour retarders: Maximum reliability for built structures

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