The first products of TimberLogic were the Span Table Report and the Log Wall Performance Estimator. Companies who have completed the process of developing these reports have expressed satisfaction in many areas—better material use, improved estimating accuracy, and coordination of specifications from design through production, to name a few.
To initiate the process for a new TimberLogic Report, select an option from the list and click on "Buy Now" to go to PayPal to purchase it. We will work with you to complete a Data Form to complete the reports.
All TimberLogic documents are formatted to an 8-1/2”x11” page, printed to Adobe Acrobat Portable Document File (pdf), and transmitted electronically by e-mail attachment. While proprietary information is held confidentially, TimberLogic retains all rights to the formats, organization, and methods used in generating the documentation.
There are many benefits to investing in TimberLogic Reports:
- Refine product development
- Reduce change orders by accurately communicating estimated framing and beam specs to design and production
- Reduce time in plan development with design guidelines for corporate staff and outside professional designers
- Integrate results into your plan cover sheet, construction manual, details, and even sales literature
- Use the process to correlate product specs from sales to purchasing through delivery to insure efficiency and customer satisfaction
- Reduce time in review by outside entities such as building officials and engineers who can quickly verify application of the structural specs -- loads, capacities, and material selection
- Demonstrate compliance with ICC400!
All TimberLogic Reports are available in the standard form or may be fully customized to meet your specific needs.
Using ASHRAE Fundamentals and Standards, alternative building assemblies are documented to establish thermal properties to demonstrate compliance with energy codes. The reports showing the calculation should be attached to plans or REScheck® calculations when the u-factors or R-values have been entered. calculations when the u-factors or R-values have been entered.
Services range from custom analysis on elements of the thermal envelope or use of energy performance software.
- REScheck® thermal envelope analysis
- Custom assembly calculations
- Evaluation of building systems to improve performance.
While there are many references available relating to the allowable spans of structural framing, the TimberLogic Span Table Reports (STR) are tailored specifically to the materials that are included in your standard framing package(s). This report includes options for lumber, solid timber, log, built-up and glue-laminated beams.
The STR provides in-house staff with guidelines for estimating and design in a single reference document for consistent specification that can simplify plan development and resulting material lists. This report can show outside engineers and building officials why certain size timbers are used in plans.
With full substantiation in the report for load development, the document is as useful for building officials and reviewing engineers as it is for estimating and design staff. Employed in estimating and design, the tables can reduce in-house change orders caused when design corrects a beam size from the estimate. Providing this report to outside engineers and even building officials can insure that any changes they request will be according to your material specifications.
The STR creates a report specific to your company’s log and timber frame products. This report details span capacities for various loading scenarios:
- Section 1: Members Used in Framing Systems – design stress values, section properties
- Section 2: Load Criteria – live and dead loads applied vertically on the systems
- Section 3: Span Tables – Maximum allowable spans for T&G decking, floor joists, floor girders, rafters, ridge beams, porch lintels, hip & valley beams, and load capacities for timber/log posts.
reports offer span tables for specific building systems. Custom reports can be developed to report
only on the specific structural elements used in a building system.
- Floor loads — 30 and 40 psf
- Roof loads — 20, 30, 35, 40,50,60,70 psf
- Spacing of framing — 16, 24, 32, 48 inches on center
- Building widths — 8 feet to 32 feet in 4-foot increments
Demonstrate whether the performance of a log wall system meets or exceeds the requirements of ICC400.
The Log Wall Performance Estimator (LWPE) is a report that describes and analyzes a specific log building system (a specific log profile, wood species, and moisture content). It reports the performance of an individual log profile in a manner designed to assist outside engineers and code officials evaluate the building system, help refine product development, and provide designers with critical capacities to be considered during plan layout.
The first page of the LWPE report provides the properties of the log profile, while the next 9 pages report the capacity of the log wall as an assembly.
The resulting report shows the log profile with grading criteria and associated design stress values, establishes settling allowances, calculates the wall’s fire-resistance rating and thermal properties. The report also includes design capacities for the log in simple span conditions (e.g., headers, interior girders, etc.), and provides information relating to fastening options.
The LWPE provides design limitations for layout of a log structure in a form that can be used by designers during the creation of the plans. The report consists of
- A log profile sheet with an illustration of the wall-log and data pertaining to the individual component (section properties, weight, visual grading criteria, design stress values, average wall thickness, thermal value, fire-resistance rating, and settling analysis).
- An analysis of the structural capacity of a wall-log for both horizontal and vertical load paths, expanded to demonstrate allowable loading (plf) for 7 spans.
- Tables presenting maximum allowable spans for wall-logs of three structural grades for 1-, 2-, and 3-course beams/headers supporting vertical loads. Additional information is provided for bolted headers.
- A presentation of the estimated performance of the log wall as an assembly in response to horizontal loading.
Using the Log Wall Report
The first page of the report provides the properties of the log profile, while the next 9 pages report the capacity of the log wall assembly.
PAGE 1: Shows the log profile and physical properties relating to its species, strength, size, shape, and moisture content. The data on this page is generated to comply with ICC code requirements.
PAGES 2 TO 4: Provide designers with tables relating to the structural capacity of the log profile.
- Building codes have long required that structural products be certified as to their strength. This assessment is made for wood products through stress grading.
- In addition to the design stress values, the slope of grain and maximum allowable knot size are calculated in the report in accordance with applicable American Society for Testing & Materials (ASTM) standards. Certified graders on the your log production line use this criteria to visually inspect each log and assign a grade.
- The education component here is to make sure that the designer specifies the grade for each log placed in the structure, the certified grader marks the log with an identifying mark, and the builder installs that grade of log in the particular position.
PAGE 3 contains tables that report the number maximum allowable header spans for the wall-log for different grades and different multiples of log used in a header.
- Sections 1.2 through 1.4 provide reference tables for the structural capcity of a single log, then relate that capacity to an applied load for a specific span length.
PAGES 10 & ON...
- Beginning on page 5, Section 1.5 combines the log properties from Section 1.1 (page 1) with the standard fastening schedule to define the maximum unsupported length of a sidewall (typically the eave wall, or one facing the wind). The fastening schedule may become slightly restricted due to high wind speeds.
- Section 1.6 on page 6 explores the structural capacities of the log wall under horizontal loads. The primary focus of this section is to establish the required fastening schedule to match the maximum allowable wall span and to satisfy the load zones in shear walls.
- Pilasters are analyzed (page 8) as a method for supporting the log wall. Also referred to as a stiffener post, pilasters are an alternative where interior shear walls are not available.
- Generally speaking, shear walls that are at least as long as they are high will not require special fastening requirements. However, shorter wall segments or walls with openings can require twice as many fasteners to account for the shorter length of wall available to resist the shear loads.
The detailed analysis of the log wall system that is summarized on pages 1 through 9. These pages are provided as substantiation for design professionals who need to know how the summary data was generated. These pages should be included in copies of the Log Wall Performance Estimator that is provided to anyone involved with structural analysis and code enforcement.