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Purlins (purline)
Purlins, as opposed to rafters, is common in timber frame construction. It is a horizontal structural member in a roof. Purlins support the loads from the roof deck or sheathing and are supported by building walls.

Horizontal beams in a roof upon which the rafters rest.
Plain single colour 'geometric' floor tiles made from clay, often red or brown, usually unglazed. (from the French word carre' meaning square) ...

Purlins: A horizontal structural member spanning between beams or trusses to support a roof deck. In slope glazing, purlins are the horizontal framing members.
Push Stick: In hardware, a tool used when cutting a short board on a table saw.

1. #10 x 1-3/4" Aluminum round head wood screw with armored Neoprene washer.
2. #10 x 1" Aluminum round head wood screw with 1/2" armored Neoprene washer.
3. 1-3/4" x .145" Aluminum roof helix nail with Neoprene washer.

Purlins must be at the correct centres and size for the material and slope of the roof. The position of purlins at the upper and lower ends of the roof and at the sheet overlaps are the critical points, there must be purlin where you need to nail.

Horizontal members extending between rafters for supporting the glass on slope-glazed systems.
PVC ...

Purlins: Horizontal roof members lay over trusses to support rafters.
Quarter round: A small molding that has the cross section of a quarter circles.
Quarter-sawn: Lumber which has been sawn so that the medullary rays showing on the end grain are nearly perpendicular to the face of the lumber.

Are Purlins Necessary for Proper Installation of Metal Roofing?
Metal roofing has come a long way in the last few decades. From its inception, metal roofing offered a structurally sound surface that resisted high winds and didn't deteriorate as quickly as asphalt or wood shingles.

Posts and Purlins
Once the joists are all down, the cap logs can be set in place over them. These are notched to fit over the joists and hold them in place.

After bolting purlins to the trusses, I nailed the boards on the purlins and ridgepole. I laid rosin paper on top of the roof boards, then put 1½- x 5-inch rafters on, anchored with metal brackets. The rafters were centered at 24 inches. I used 3½-inch fiberglass insulation between rafters.

19: Install the Purlins
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(2) an inclusive term for joists girders rafters and purlins
Bearing Wall A wall that supports a floor or roof of a building.
bedding a filling of mortar putty or other substance in order to secure a firm bearing ...

A traditional cut roof (purlins and rafters) can usually be converted without too much structural alteration for around £950- 1,250/m², but if the roof is made with modern trusses (a web of thin timbers) the structure will have to be replaced, adding significantly to costs.
Could you remodel?

the roof panel has sufficient strength to span between purlins or nailers). A hydrostatic architectural panel (which cannot span between supports) may be specified if a solid deck is provided.

sub-purlin (panne secondaire, f.) A secondary system of beams parallel to the purlins and supported by the rafters; is sometimes employed to support tile or slate weathering surfaces.

Lumber, timbers. Yard lumber 5 or more inches in least dimension. Includes beams, stringers, posts, caps, sills, girders, and purlins.
Lumber, yard. Lumber of those grades, sizes, and patterns which are generally intended for ordinary construction, such as framework and rough coverage of houses.

TRUSS RAFTER: Truss spaced close enough (usually 24" o.c.) to eliminate the need for purlins.
UNDERPINNING: A foundation replacement or reinforcement for temporary braced supports.

- a flat roof profile with frequent trapezoidals. Needs to be supported by rafters and purlins.
- framework supporting the house roof. Not a component of Patio Covers.

(1) Fiberglass or other compressible fibrous insulation, generally available in roll form; (2) Fibrous glass insulation in roll form, often installed between the metal roof panels and the supporting purlins or attic.
A sheet metal material used to prevent the migration of bitumen.

It can be shaped into forms ranging from straight beams to complex curved members, and is used in a wide variety of residential and nonresidential building construction applications, including headers, floor girders, ridge beams and purlins, cantilever beam systems, arches, ...

See also: See also: What is the meaning of Building, Roof, Design, Floor, Construction?

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