The uk dictionary definition of the word fenestral or fenestrate is " belonging to or like a window" The word fenestration is "the arrangement of windows in a building". FENSA is used by double glazing uk trade companies to certify that their replacement windows and doors installed comply with Building Regulations Document L (and more), actually checking av. 1% of all replacement windows installations.

Did You Know?

That Health & Safety Executive legislation now requires that
ANYONE who can potentially fall more than 2metres whilst working
should be provided with and use a fall arrest protection system!

Double glazing and cladding is almost the same industry.

In fascias soffits bargeboards shiplap cladding architraves and trims around windows and doors etc., PVC-UE the 'e' stands for expanded.

Expanded un-plasticised Polyvinyl Chloride (PVC-UE) is PVC-U which has been given a foamed cellular structure by the inclusion of a expansion agent during the manufacturing process. This cellular structure reduces product weight, and increases thermal performance. Environmentally friendly manufacturers use only sodium bicarbonate (baking soda) as an expansion agent as it generates no harmful by products and no CFCs are used in the production process.

For fascias soffits bargeboards shiplap cladding etc., PVC-UE is an ideal material for non structural components as its properties include:

• Weather resistant, impermeable and non absorbent, ideal for low maintenance.

• Does not rot, warp, shrink or biologically decompose.

• Resistant to acids, alkalis, atmospheric gases, dust and dirt.

• Resistant to vermin and insect attack.

• Impact resistant.

• Dimensionally stable within normal UK climatic conditions.

Typically PVC-UE products used in our industry are used for:

• Trims around windows and doors, both indoors and outdoors. Profiles in common use include Architrave,
  Quadrants, 'D' section, interior window boards and reveal liners, etc.

• Roofline board replacements of Fascias, Soffits, Bargeboards and cladding,
  such as Shiplap and T-G-V (tongued, grooved and vee).

These pictures show some of the finer detailing of a recent job (March 2002):

For practical information on cladding with diagrams see:

Doing Cladding

For anyone interested in cladding in Essex, either cash and carry supply only for the full range of cladding, trims and guttering etc., or full installation job, then I heartily recommend a visit to the website of the longest established (1984 continuous trading) cladding company in the County:
http://www.duraclad.co.uk