Every window and door installation faces a unique set of challenges. From coastal exposure to frequent use, performance requirements can vary significantly depending on the application.
While a specified product may provide the appearance the client desires, problems can arise if the conditions it will be exposed to are not adequately considered.
Geography plays a key role. In coastal and highly exposed locations, including parts of the South West, Scotland, and other areas subject to severe weather, windows and doors must be appropriately specified for their surroundings.
“Resistance to wind loading, watertightness, and air permeability are key performance considerations, particularly for homes and buildings in exposed locations,” says Lee Galley, Inspection Manager at RISA.
“The specification should identify the performance levels required for the site and these should be supported by appropriate test evidence. A window or door set suitable for a sheltered location may not achieve the performance needed in a more exposed position. Inadequate specification for the location is something we see quite frequently at RISA.”
Coastal locations also require appropriate consideration of corrosion resistance, particularly for hardware, fixings, and finishes.
Beyond weather exposure, frequent use, building height, and occupancy can affect the required durability, operating characteristics, safety, and security provisions.
That means looking beyond the product itself - understanding what the completed installation needs to achieve is essential.
“It’s a case of horses for courses,” says Lee. “A product that performs well in one application might be unsuitable for another. That is why the specification needs to reflect the particular conditions on site, rather than assume that a standard product will do.”
However, specification decisions are sometimes made without sufficient specialist window and door expertise.
A disconnect between those selecting the products and those assessing their suitability for the application is a common source of problems RISA encounters on complex projects.
Errors in specification can lead to substantial remedial work, additional costs, and disruption for residents, especially on large commercial projects involving multiple properties.
They can also put installers in a difficult position when they are expected to deliver a compliant installation but have had limited influence over the original product selection.
To help avoid this scenario, RISA advocates identifying potential problems early, preferably before manufacture begins.
As an independent inspection service, RISA can review specifications and supporting documentation to help establish whether the proposed products are appropriate. This includes considering whether the required performance levels have been addressed and whether the evidence is relevant to the proposed sizes, configurations, and intended use.
“Prevention is better than cure,” says Lee. “Our role is to avoid problems further down the line by examining and, where necessary, challenging the decisions that could create them.”
“Early involvement allows us to ask the right questions and flag potential gaps in the specification or supporting evidence. It is far better to address those issues before manufacture than to discover them once the products have been installed.”
This approach can provide installers with greater confidence in the suitability of the products they are fitting. For developers, it offers an opportunity to reduce the risk of costly remedial work and disruption, as well as supporting long-term product performance for occupants.
Used proactively, independent inspection can bring specialist knowledge into the decision-making process and reduce the risk of specification errors.
“As construction projects become increasingly complex, early involvement from RISA is significantly more cost effective than addressing problems after the installation,” affirms Lee.
“Our role is to compare what has been specified with what the building actually needs and help identify any gaps between the two. If we can do that before manufacture and installation begins, there’s far less to potentially put right.”
