C33 Wallcovering Installation and Preparation 3

Question 1

Under California building codes, what fire-rating requirement applies to wallcovering installed in commercial occupancy corridors?

Accepted Answer

Wallcovering must meet a Class A (Class I) flame-spread rating per ASTM E84

Answer

No fire-rating requirement exists for commercial corridors

Answer

Only Class C (Class III) flame-spread rating is required

Answer

Wallcovering is prohibited in commercial corridors

Question 2

When a wallcovering strip develops a bubble after installation, what is the correct repair method for a small bubble?

Accepted Answer

Inject adhesive under the bubble with a syringe, press flat, and roll the seam

Answer

Tear the bubble open and re-paste from the edge

Answer

Apply heat with a heat gun until the bubble flattens

Answer

Remove the entire strip and re-hang

Question 3

What does the term 'selvage edge' refer to in wallcovering?

Accepted Answer

The factory-finished, untrimmed edge of the wallcovering roll that must be removed before hanging

Answer

The decorative border along the top of the roll

Answer

The protective coating applied to the face of the wallcovering

Answer

The pattern repeat measurement printed on the label

Question 4

Which tool is used to firmly smooth out air bubbles and ensure full adhesion when hanging vinyl wallcovering?

Accepted Answer

Plastic smoothing brush or broad knife

Answer

A natural-bristle paint brush

Answer

A rubber mallet

Answer

A foam roller

Question 5

When calculating how many double rolls (bolts) of wallcovering are needed for a room, what measurement is typically used to account for doors and windows?

Accepted Answer

Subtract one single roll for every two standard-sized openings

Answer

Do not subtract anything; always measure full wall height times perimeter

Answer

Subtract one double roll for every door or window

Answer

Subtract 10% of the total calculated rolls

Question 6

What is the main reason wallcovering should NOT be applied over bare, unprimed concrete block walls?

Accepted Answer

The alkalinity of concrete can deteriorate the wallcovering adhesive and material over time

Answer

Concrete is too smooth for adhesive to bond

Answer

Concrete block walls are always too moist

Answer

Building code prohibits wallcovering on masonry in all cases

Question 7

Which industry organization publishes the standard specifications for commercial wallcovering types (Type I, Type II, Type III) referenced by California commercial projects?

Accepted Answer

Chemical Fabrics & Film Association (CFFA)

Answer

American Institute of Architects (AIA)

Answer

National Painting & Coatings Association (NPCA)

Answer

Wallcovering Association of California (WAC)