NRCA Tile Installer flashcards
NRCA Tile Installer · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Fall protection trigger height
- OSHA requires conventional fall protection for work on steep-slope roofs at 6 ft or more above a lower level, and the system must be in place before work begins.
- Guardrail height
- A guardrail top edge must be 42 in. plus or minus 3 in. above the walking surface, with a midrail at about half height and a toe board at the bottom.
- Personal fall arrest anchor
- A personal fall arrest system requires a full-body harness and an anchor rated at 5,000 lb per worker, with a maximum free fall of 6 ft.
- Ladder extension above eave
- A ladder used for roof access must extend at least 3 ft above the eave or landing point, and be set at a 4:1 angle.
- Roof jack fastening
- Roof brackets and roof jacks must be fastened into structural framing members, not sheathing alone, and must not exceed their rated load.
- Minimum slope for tile
- Standard tile assemblies require a minimum roof slope of 4:12; slopes from 2.5:12 to 4:12 need a doubled underlayment or approved low-slope assembly.
- Deck deflection limit
- Most tile roof assemblies require the deck to limit deflection to L/360 under total load, unless the tile manufacturer requires a stiffer deck.
- Sheathing thickness for tile
- Solid sheathing for tile roofs is typically at least 15/32 in. plywood or 7/16 in. OSB, fastened with 8d common nails at 6 in. edges and 12 in. field.
- Underlayment lap rules
- Steep-slope underlayment laps at least 6 in. on sides and 12 in. at ends, with upper sheets lapped over lower sheets so water sheds down-slope.
- Ice dam membrane extent
- Where ice dam protection is required, self-adhering membrane runs from the eave edge to at least 24 in. inside the warm wall line.
- ASTM C1167
- ASTM C1167 is the standard specification for clay roof tile, covering Grade 1 through Grade 3 and freeze-thaw durability testing.
- ASTM C406
- ASTM C406 is the standard specification for concrete roof tile, with Grade A as the highest grade for durability and strength.
- Roofing square
- A roofing square equals 100 sq ft of roof area; tile quantity per square depends on the manufacturer's exposure and pieces per square.
- Tile weight reference
- Concrete roof tile typically weighs 8-12 lb per sq ft and clay tile 6-10 lb per sq ft; always verify the actual product data for structural design.
- Step flashing lap
- Step flashing uses one piece per tile course, at least 4 in. by 4 in., lapped 2 in. and set under the tile above and over the tile below.
- Chimney cricket requirement
- A cricket or saddle is required on the up-slope side of a chimney when the chimney width exceeds 30 in., to divert water around it.
- Open valley width
- An open metal valley is typically at least 24 in. wide, 12 in. on each side, with each course lapped so water flows over the lower piece.
- Kick-out flashing
- Kick-out flashing at a sidewall diverts water away from the wall and into the gutter; a missing kick-out is a common cause of rot and leaks.
- Tile layout centerline
- Tile layout starts from a true vertical centerline or a full-tile edge, so cut tiles fall at the rakes and the field stays symmetrical.
- Tile exposure
- Exposure equals the tile length minus the headlap; the manufacturer's exposure determines pieces per square and the total order quantity.
- High-wind tile fastening
- In high-wind zones, typically 90 mph basic wind speed or greater, fasten every tile and add fasteners at hips, ridges, and perimeter edges.
- Nail penetration into sheathing
- Tile nails must penetrate the sheathing at least 3/4 in., and must not be overdriven; leave the head slightly above the tile surface.
- Eave closure purpose
- A bird stop or eave closure blocks wind-driven rain and prevents birds from entering the open profile at the eave of a tile roof.
- Hip and ridge fastening
- Hip and ridge tile require at least two fasteners per piece, set over a hip or ridge batten or mortar bed per the manufacturer's instructions.
- Closed-cut valley
- In a closed-cut valley, tile from one slope crosses the valley and is cut along a line parallel to the valley on the other slope.
- Valley underlayment width
- Valley underlayment is a membrane or metal at least 24 in. wide, extending at least 12 in. up each slope beneath the tile.
- Low-slope tile assembly
- Roofs from 2.5:12 to 4:12 require a doubled underlayment or a proprietary waterproofing assembly, detailed per the tile manufacturer.
- Batten fastening
- Tile battens must be fastened into framing or sheathing per the manufacturer; battens must not rely on sheathing alone for attachment.
- Broken tile replacement
- To replace a broken tile, lift the tile above, slide the new tile into place, and fasten through the existing nail holes without nailing the tile below.
- Leak diagnosis priority
- Leak diagnosis starts at flashings, valleys, and penetrations, which cause more leaks than failures in the tile field itself.
- Slope factor formula
- The slope factor equals the square root of 1 plus the rise over run squared; multiply plan area by the slope factor for actual roof area.
- Roof area estimating
- Actual roof area equals plan area times the slope factor; add 10-15% waste for hips, valleys, and field cuts when ordering tile.