Tag Archives: Entry doors

Partially Enclosed Buildings

Partially Enclosed Buildings (and Why It Matters)

I have previously written how a fully enclosed building could be less of an investment than a three sided building – even though a fourth wall has been added: https://www.hansenpolebuildings.com/2014/03/three-sided-building/

For those of you who neglected to click and read my previous article, consider your building as a balloon, rather than a building. Until tied (enclosing your balloon), your balloon is partially enclosed. More air can enter through its neck and if over-loaded “BOOM”!

From a structural aspect on buildings, force multipliers are applied to adjust wind forces upwards in order to combat “BOOM”. But what actually constitutes a partially enclosed building?

A building is considered “Partially Enclosed” if it complies with both of these following conditions (ASCE 7-10, Section 26.2, “BUILDING, PARTIALLY ENCLOSED”):

  1. the total area of openings in a wall that receives positive external pressure exceeds the sum of the areas of openings in the balance of the building envelope (walls and roof) by more than 10%, AND
  2. the total area of openings in a wall that receives positive external pressure exceeds 4 square feet or 1% of the area of that wall, whichever is smaller, and the percentage of openings in the balance of the building envelope does not exceed 20%

IF EITHER IS NOT TRUE, ENCLOSURE BY DEFINITION IS NOT PARTIALLY ENCLOSED.
 
On occasion, building officials will assume a building originally designed as enclosed to be partially enclosed if storm shutters are not provided, a conservative worst-case approach, but is defendable by fact there is no written code provision for this and the structure won’t meet the above definition. Also, everything needs to be designed for partially enclosed, roof, connections, walls, foundation, beams, columns, etc. A building won’t stand if only one part of it is designed as partially enclosed and not the rest.

It is possible to have a building appearing to be fully enclosed, when in reality it is not. 

How could this occur?

Failure to use wind-rated doors and windows!!

Sliding “barn” doors are not wind rated. Neither are most entry (person) doors.

Most sectional overhead garage doors are not wind rated. https://www.hansenpolebuildings.com/2014/12/wind-load-rated-garage-doors/

This becomes especially critical in cases of barndominiums, shouses (shop/house) and post frame homes. Many of these have a wall with one or more garage doors. If these doors are not wind rated doors, in an extreme weather condition they could be literally sucked right out of your home, leaving it prone to forces it was not structurally designed for!

Lives are priceless, please do not try to save a few bucks upfront by risking you or your loved ones.

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.