Spread Footings Ready at The Preserve at Pine Meadows

September 25, 2009

I was out to inspect the spread footings today in the Preserve at Pine Meadows and everything looked great. The contractor, Bud Moore with American Craftsman Homes met me out there and we went over the schedule for the reamining concrete pours.

He was very complimentary about how the home nestled into the site and also how we nailed the views from the home’s footprint.

This is the second project that we designed in The Preserve that American Craftsman Homes has built and the third design in the development. We look forward to many more in this great mountain community.


Pink Fog Studio Stairs – Open Riser Steel Stair With Oak Treads

August 22, 2009

Pink Fog Stair

Jim and I went by Pink Fog to inspect the steel connections on the stair to the loft.

Due to existing conditions, we designed a stair that would avoid placing a post in front of a window. The design required both cantilevered upper floor framing and a cantilevered stringer. In order to make this work, we utilized a unique structural design with a bent frame to handle the torsional force and the cantilevers.


New Openings in Existing Concrete Double T Wall at Evergreen Mercantile

August 21, 2009

evergreen mercantile-demo 081809

On August 18, the removal of the 2″ concrete flanges of the concrete double T wall began.  EVstudio engineered the front wall to allow for the new openings and provided details to adequately brace the structure with the remaining wall lengths.  When construction is completed you won’t be able to tell this was once a double T wall building with the typical visible flanges.


How To Read Metric Rebar Marks on Steel Reinforcing

August 20, 2009

In order to identify the basic information about the rebar that is delivered to a jobsite, it is important to know how to read the mill markings that are stamped on every bar. This is especially critical to ensuring that your materials match up with the specifications in the plans.

These mill markings illustrate the “soft metric” system adopted by CRSI member mills in 1997 (see our post about metric and imperial markings):

grade4201

Grade 420 Mill Markings

Images and bar marking description courtesy of CRSI

The top letter or symbol identifies the producing mill and deformation pattern.

The next marking is the bar size.

The third marking symbol designates the manufacturing material — usually either “S” for carbon-steel (ASTM A615) or “W” for low-alloy steel (ASTM A706).

Finally, there will be a grade marking (4 or 5, for 420 or 520) or by the addition of one line (420) or two lines (520) that must be at least five deformations long.

For more information, please visit www.crsi.org/rebar


Trusses Go Up at Kershenstein’s Honka Log Home

August 19, 2009

01 033_01

On Sunday I stopped by the Kershenstein residence to see what progress has taken place. Along with the upper floor framing and upper framed walls, the upper level trusses look to be almost all in place. Also on the lower level, temporary bracing is in place until the stone clad concrete masonry columns are built to support the main level deck above.


Differences in Metric and Imperial Reinforcing Bar (Rebar) Grades and Sizes

August 17, 2009

All Contractors should be intimately familiar with Steel Reinforcing Bar (Rebar) grades and sizes. With materials coming from all over the globe these days, it is ever important to know the comparison between the Imperial and Metric systems for bar grading and sizing. Starting in 1997, CRSI member steel mills have adopted new “soft metric” standards in their grading and sizing. 

The charts below should be used to cross reference imperial grades and sizes with metric grades and sizes. Watch out because if your specs are in metric and your supplier is still using the imperial system, you may wind up with some really huge bar diameters on site. As you can see, the old #4 (1/2″) bars are now being called out as #13, so be very careful here to avoid these kinds of potentially costly mistakes.

Soft Metric Bar Sizes vs. Inch-Pound Bar Sizes:

Metric Bar Sizes Inch-Pound Equivalents
#10
#13
#16
#3
#4
#5
#19
#22
#25
#6
#7
#8
#29
#32
#36
#9
#10
#11
#43
#57
#14
#18

 

Inch-Pound
Grade
psi* Minimum
Yield Strength
Metric
Grade
MPa** Minimum
Yield Strength
40 40,000 280 280
50 50,000 350 350
60 60,000 420 420
75 75,000 520 520

* pounds per square inch
** megapascals

For more information, please visit www.crsi.org/rebar


Types and Design of Wood Trusses

August 16, 2009

truss description

Here are some great resources about the different types of wood trusses and how they are designed.  If you have any questions about roof or floor trusses please let us know.

Alpine Engineered Products – Builder’s Guide

SBCA – Structural Building Components Association – Truss Configurations