Specialty Finishes, Wallcoverings, and Decorative Techniques
Specialty Finishes, Wallcoverings, and Decorative Techniques tests wallcovering layout, paste selection, pattern matching, and the discipline of sample boards for decorative work. The exam favours repeatable method over artistic improvisation.
Wallcovering layout
- Confirm roll width, roll length, pattern repeat, and match type: straight match, drop match, or random match.
- Keep roll and dye-lot numbers together; alternate strips from adjacent rolls where shade variation is possible.
- Prime or size the wall according to the paste and substrate. Book vinyl and paper strips to relax and equalize paste before hanging.
Decorative techniques
- Faux finishes, metallic glazes, stencils, and murals require an approved sample board under the actual lighting.
- Work in manageable sections, maintain a wet edge, and protect adjacent finishes with suitable tape.
- Test the system on the substrate; porosity and sheen change the result.
Worked example
A wall is 3.6 m wide and 2.5 m high. Wallcovering roll = 0.53 m × 10 m; pattern repeat = 0.64 m; drop match. Strips = 3.6 ÷ 0.53 = 6.79, so 7 strips. Cut length per strip = 2.5 + 0.64 repeat allowance + 0.10 trim = 3.24 m. Strips per roll = 10 ÷ 3.24 = 3.08, so 3 usable strips. Rolls = 7 ÷ 3 = 2.33, so order 3 rolls. Waste and matching explain why the third roll is necessary.
Traps that cost marks
Mixing dye lots; failing to book paper; ignoring a drop match; using the wrong paste on vinyl; skipping sizing and getting paste bleed; and approving a decorative sample under different lighting from the site.
Key points
- Record roll width, length, repeat, and match type before ordering.
- Keep dye lots together and alternate strips.
- Prime or size according to paste and substrate.
- Book strips and use the correct paste.
- Approve decorative samples under site lighting.