Tag Archives: Rafters

A Stone Base Floor? Trusses vs Rafters, and Entry Door Install

DEAR POLE BARN GURU: I have a 40 x 24 pole barn with a 4 inch stone base floor. Can I place 2×4 grid framing 24 in on center with 3/4 inch T&G 4 x 8 sheets for light weight shop usage? No vehicles. JEFF in SYCAMORE

DEAR JEFF: Some ifs – if your site is drained so as to not have excess moisture beneath the building, if the subgrade is thoroughly compacted and if you have a well-sealed vapor barrier underneath, then it might work. Be prepared for the possibility of frost heaving. Both the framing and the sheathing should be pressure preservative treated to a minimum UC-4B level to prevent possible deterioration.

 

craigslist pole barnDEAR POLE BARN GURU: You compare scissor trusses to conventional trusses, but I see nothing about using beams instead. I’m aware of only one post frame supplier that provides beam systems in lieu of trusses. Are there any down sides to using beams and avoiding trusses all together? RACHEL in ST. LOUIS

DEAR RACHEL: My only guess would be you mean rafters, not beams. Or it could be your intent is a ridge beam supporting rafters. In any case, the answer is going to come down to time, money and reliability. If an alternate system to prefabricated wood roof trusses is to be used, it should most certainly be a design which has been thoroughly reviewed and sealed by a Registered Professional Engineer. Obviously prefabricated wood roof trusses are most highly prevalent because they offer the advantages without the expense of time and labor.

DEAR POLE BARN GURU: Can I install a 36″ steel entrance door before the exterior girts are applied? DONAVON in EAGLE GROVE

DEAR DONAVON: In most cases, the columns on one or both sides of the entry door are trimmed off above the door and supported by a wall girt which runs between two roof supporting columns. If your particular application has framing on both sides of the door which is attached to the roof system, then it would probably be possible to install the entry door prior to the wall girts. I am not seeing any apparent advantage to doing so and it would add to the possibility of inadvertent damage to the door.

 

Deep Fascia Overhangs

The definition of Fascia from the sum of all human knowledge (Wikipedia):
“Fascia (/ˈfeɪʃə/) is an architectural term for a vertical frieze or band under a roof edge, or which forms the outer surface of a cornice, visible to an observer.

Typically consisting of a wooden board, uPVC or non-corrosive sheet metal, many of the non-domestic fascias made of stone form an ornately carved or pieced together cornice in which case the term fascia is rarely used.

The word fascia derives from Latin “fascia” meaning “band, bandage, ribbon, swathe”. The term is also used, although less commonly, for other such band-like surfaces like a wide, flat trim strip around a doorway, different and separate from the wall surface.
The horizontal “fascia board” which caps the end of rafters outside a building may be used to hold the rain gutter.”

In layperson’s terms, the fascia is the outside member of an overhang which is extended past the eave side (where the rain water drips or snow slides off) off a building.

For most residential structures, the fascia board is a 2×6 or 2×8, which provides an overall fascia height approximating five to seven inches depending upon slope of roof, etc.

Open OverhangsThere are some cases where it is advantageous to increase the height of the fascia, these would include (but are not limited to):
Aesthetics (aka looks) – some people like the look created by a deep fascia overhang.
Supporting signage – on commercial buildings having a deep fascia on the eave side of the building several feet in height can allow for signs for a business or businesses to be placed.

We recently ran across an instance where a client needed to have a tall door in the endwall of his new post frame (pole) building, however his Planning Department had a strict limitation upon the allowable height of building sidewalls.

Enter the thinking caps.
By the creation of a deep fascia overhang, the eave height (read more on how eave height is measured here: http://www.hansenpolebuildings.com/2012/03/eave_height/) was able to be increased by several feet, without the need for longer siding – meeting the strict requirements of the Planning Department!