Understand each opening's exposure
List the location, orientation and dimensions of the openings. Consider direct sunlight, rain exposure, dust and the use of the rooms behind them. These conditions inform the discussion about timber preparation, protective finishes, glazing and seals. A sheltered courtyard opening and an exposed villa facade may need different specifications even when their appearance is similar.
Review the complete system
Assess the timber profile, glass, seals, drainage provisions and hardware together. Choose the opening mechanism around access, ventilation and usable space. If thermal, acoustic, weather or security ratings are required, ask which documented specification and test applies to the proposed system. A material description on its own is not a substitute for a complete performance specification.
Coordinate installation and maintenance
Confirm site dimensions and the junctions with stone, plaster, waterproofing and floor levels before manufacture. Agree responsibility for fixing, sealing and final adjustment. Request the maintenance requirements for the supplied finish and hardware, including any conditions that affect the stated warranty. Keep the approved drawings and product information with the home's maintenance records.