Whether a project is a new-build development or a refurbishment, weatherproofing building penetrations is an important part of protecting the building envelope. However, the challenges for each type of project can be very different.
In new builds, typically, weatherproofing and penetrations can be planned, providing greater control over design, materials, sequencing and access. Refurbishments, on the other hand, are often prompted by an existing problem, or the need to upgrade or replace existing services. Weatherproofing teams must work with what is already there – including existing roofs and facades, rooftop plant and live services – while information about the build-up may be incomplete or inaccurate.
For architects, specifiers, contractors and building owners, understanding these differences can help identify potential risks and ensure that building penetrations are weatherproofed efficiently and effectively.
Building information and existing conditions for effective weatherproofing
One of the biggest differences between new-build and refurbishment projects is how much building information is available and how accurate it is.
On a new build, the weatherproofing team can easily establish the roof or wall build-up and the materials used. With refurbishment projects, depending on the age of the building, information may be incomplete, difficult to come by or out of date, as previous repairs, alterations or additions may have changed the roof or facade. In addition, services may have been installed or repositioned since the original construction.
Furthermore, the choice of weatherproofing method can play an important role in sealing a building where incorrect or incomplete information is available. For example, liquid-applied weatherproofing, as used by Jones Weatherproofing, can be used on any type of roofing material. Quick to apply with no need for noisy or heavy equipment further helps to avoid disruption.
Considering the roof or facade’s condition when weatherproofing penetrations
In new-build projects, the condition of the roof or facade should typically be less of a concern, since you should be starting with a clean slate. However, if a penetration has been left exposed during wet or windy weather, its condition may have deteriorated and must be repaired before weatherproofing can be carried out.
The condition of the existing roof or facade may also affect how work is carried out. If materials are deteriorated, surfaces are unstable, or areas have been affected by previous damage, the weatherproofing team may need to take additional precautions to ensure safe access.
Building penetrations weatherproofing around live services
Refurbishment projects often take place while a building remains operational, with services live wherever possible to avoid downtime. In some locations, access may also be restricted to particular times to avoid disruption.
Where pipes, cables, ductwork or other services need to be added or removed, the positioning of existing services can restrict access to the building penetration. Pipe lagging may also make it more difficult to access the area or achieve the required weatherproofing detail. In contrast, factory-made details such as weatherproofing cabinets may not accommodate changes to existing services.
Flexibility when weatherproofing new-build penetrations
On new-build projects, the building envelope and services are being designed together, allowing planning and coordination of the building penetrations before installation begins. Penetrations can be positioned with the construction sequencing in mind, and access can be considered alongside the rest of the roof, cladding and other trades.
However, new-build projects also require practical flexibility. With so many parts coming together on site, service requirements and layouts often change during construction.
Why sequencing matters on every weatherproofing project
With all projects the timing of weatherproofing installation is an important consideration.
On a new build, with good communication and early engagement, the building envelope, services and weatherproofing can all be coordinated so that each trade has the access it needs and penetrations are sealed at the appropriate stage.
Whilst refurbishment programmes can be more unpredictable, site surveys and careful planning can help ensure weatherproofing is carried out at the right time, giving installers appropriate access, reducing the risk of weather damage, and helping ensure completed weatherproofing is not compromised by subsequent works.
Managing unexpected site conditions and building penetrations weatherproofing
In any project no amount of design information or planning can eliminate uncertainty. This is why installation flexibility and specialist experience can be especially valuable.
Liquid weatherproofing can be formed in situ around complex building penetrations. It can accommodate any service configuration, as well as last-minute alterations making it suitable for both new-build projects and refurbishments. It also means that unexpected variations in materials won’t stand in the way of effective weatherproofing.