The Complete Guide to Roof Trusses: Design, Cost, Framing & More

When it comes to roof trusses, you need to consider everything from design to cost to the pros of using trusses instead of stick framing a roof. If you’re looking for a complete guide for roof trusses, then you’ve come to the right place.

You can use the links below to navigate throughout the guide:

1. Pros of Using Roof Trusses Instead of Stick Framing

2. Pricing Roof Trusses    

3. How to Order Trusses

The Pros of Using Roof Trusses Instead of Stick Framing

The pros of using roof trusses drastically outweigh the pros of stick framing. Sure, there may be an instance where stick framing is your only option, and that is understandable. But 99% of the time, a roof truss is going to give you so much more.

Here are the pros of trusses:

-Roof trusses are actually engineered – all of our trusses have an engineer seal on them which means they have met universal standards.

-Trusses are built in a controlled environment out of the elements of weather. This means the building process isn’t affected by rain or snow.

-Trusses span greater distances without having to be supported.

-Trusses are manufactured with computer-controlled saws, leading to greater accuracy, tighter fits, fewer mistakes, and less lumber waste. It’s simply more exact.

-We waste very little lumber when we build our roof trusses, which means we save more on lumber per truss we build. Try doing that with stick framing.

-Trusses are built on the ground and then lifted into place on existing walls. This eliminates more chances for people to fall and experience an accident.

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Pricing Wood Trusses for Any Project: A Step-By-Step Guide

We wish we could provide an exact answer to the question – how much will my roof trusses cost?

Although we can’t provide the exact bottom-line number (without further consultation), what we can provide is a thorough pricing guide to help you understand how wood roof trusses are priced for homes, buildings and all projects.

Below you’ll learn about the most common roof truss design and how it’s priced for projects. You’ll also learn about other designs and how pricing is affected by the change in design. And to conclude, we’ve provided a simple home design with common dimensions as an example to help you understand the complete pricing process.

[We’ve updated prices based on the current 2018 market and cost of lumber – read more about that here]

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How to Match an Existing Gable Roof & The Truss Design

Adding on to a house or structure is a great way to get more room without building an entire new house! There are several important things to know about matching existing roofs and how to do it depending on what style of roof you have, the roof truss design, and how you want to add on.

Categories of House Additions

There are two main categories that additions fall under most of the time:  T-shaped & continued.

house trusses

gable roof

Either the addition is added to form a T-shape to the house with the ridge running perpendicular to the main house roof, or the addition is continued on the end of the house making it longer with the ridge running the same way as the existing house.

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Pros and Cons of Trusses vs Stick Framing

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When comparing two things, it’s best to compare apples for apples. If you are trying to decide if you will use Trusses vs Stick Framing, there are things to take into consideration that will make a difference in your decision making.

Although we want to compare apples for apples, some things can’t be compared equally because it’s actually not possible to do it as both trusses and stick framing have some situations where one isn’t an option.

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Differences Between Trusses & Stick Framing, And Common Misconceptions

stick framing

Stick framing has been around for quite some time. Trusses are relatively new, so naturally trusses are not quite as well known or understood as stick framing. And even if you’ve known about trusses for a while, the industry is changing rapidly, so it’s good to get the latest news and details.

Difference Between Stick Framing & Truss:

Do you know what it means when we talk about stick framing a roof? Stick framing is building the roof on the construction site one piece or board at a time.

It starts with setting ridge and valley beams above the house walls. Then dimensional lumber, called rafters, are cut to fit one piece at a time and shoved up to a framer on the roof that’s balancing on scaffolding who installs the rafters.

Once the roof slope is complete, the ceiling still needs to be framed. This too is all cut to fit on the job-site one piece at a time. The roof and ceiling is literally “sticked” together.

A wood truss on the other hand is a structurally sound engineered building product. When a truss is installed on top of the walls, it builds the roof slope and ceiling at the same time as one structural piece.

Trusses can be designed in all shapes and sizes, and customized completely based on the project. The truss is built within our manufacturing facility and then fitted directly on the job-site. This reduces man hours on the job site, which reduces cost.

We can get everything designed and built within our facility, then ship the truss directly to the site and have it installed in no time.

Learn more about how we price our trusses and the possible designs you can implement.

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Designing Wood Trusses to Accommodate Appropriate Spacing

Kansas wood trussesWhen it comes to designing wood trusses, the spacing of each truss according to each design is crucial. If you miscalculate any bit of the spacing and don’t consider the use of the building you’re constructing, then you’re likely to end up with a compromised structure that can present a hazard.

Today, we want to run through a design scenario to discuss how we approach design and our consideration of spacing. If you have any questions along the way, please don’t hesitate to reach out to our team. We’re happy to help – 580-852-3660

Here’s the design scenario:

Take trusses that are spaced 4’ apart. They are loaded for a post frame construction that has purlins on the top cord with metal screwed down to that.

The bottom of the truss is open and exposed from underneath although the building will be completely enclosed. So on this 30’ span truss, it is resting on 5 ½ inches at each end.

On that small surface, there is 1560 lbs. of weight on the bearing point. This is every 4’. So if the trusses were spaced out to 8’, there would be double that amount of weight.

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Consider Attic Uses When Designing Home Trusses

wood trusses in OklahomaFraming your home with trusses comes with some key advantages. Trusses tend to be cheaper and stronger than traditional framing methods.

But trusses have one more advantage: they’re also perfect for creating functional attics.

The attic is the natural area contained within the trusses and below the roof. When designing trusses, you need to consider future use of your attic space so you can design trusses accordingly.

Top 10 Uses for Attics

An attic is the space between the roof and the ceiling of your house. Many people leave attic space unused. However, the structural part of the roof can be modified in a cost-effective and inexpensive way to add valuable square footage to your home or business in the form of a useable attic area.

Here are some of the most common uses for attics:

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How Prairie Winds Affect Wood Trusses in Kansas

Storm Clouds SaskatchewanKansas is notorious for its prairie winds. Engineers have always had to take these winds into account when designing structures across the state.

Prairie winds can be downright dangerous if you’re working with the wrong building materials.

Every day, truss designers need to take a variety of factors into account when building for the prairie winds in Kansas. Here are some important things to know about how truss systems are affected by Kansas prairie winds:

Truss builders need to calculate wind pressures using two blended methods

There are two broad ways to calculate wind pressures: Main Wind Force Resisting System (MWFRS) and Components & Cladding (C&C).

MWFRS applies to a structural frame or an assembly of structural elements that work together to transfer wind loads to the ground.

C&C applies to components that directly receive wind loads – like wall coverings, roof coverings, fasteners, and girts. Components and Cladding are typically exposed to higher wind pressures than MWFRS elements.

Trusses fall into both categories. Thus, the industry-standard practice is to design the truss to handle both MWFRS loads and C&C loads.

Truss builders need to consult wind maps to identify correct wind speeds

Building codes typically require the use of a 90-mph wind speed for inland areas of the United States. However, you’ll need to consult local wind maps and government building codes for region-specific information.

Experienced builders don’t settle with just the 90-mph wind speed standard. Experienced builders increase the durability to handle wind speeds around 100 and 110 mph. With wood trusses in Kansas, increases wind speed durability is a major consideration. All trusses must be designed to withstand substantial wind, more than the average structure.

Building usage affects wind pressure calculations

Buildings fall into a number of different usage categories. Specifically, there are three broad categories of building usages:

-Category I: A building that will have a low hazard to human life if it fails

-Category II: A building that presents a substantial hazard to human life if it fails

-Category III and IV: Buildings that are critical facilities or present a substantial hazard to human life in the event of a failure.

Different building exposures affect truss design

Buildings located on empty, flat land are more affected by wind pressure than buildings surrounded by trees and other buildings.

Building codes classify these buildings in four different ways:

Exposure A: Buildings located in downtown areas or city centers.

Exposure B: Urban and suburban buildings that are surrounded by similar-sized buildings and trees.

Exposure C: Buildings in an open area with scattered obstructions.

Exposure D: A building exposed to unobstructed wind for at least one mile over flat land.

Good truss builders take all of these factors into account

Ultimately, truss builders have a lot of responsibility. In Kansas, flat plains let wind travel unobstructed for hundreds of miles. Rural buildings and even many suburban buildings are rarely protected against substantial wind.

To take truss manufacturing to the next level, Timberlake TrussWorks builds wood trusses capable of withstanding strong winds. The key to a sound structure requires the builder to guarantee trusses are fastened tightly against the wall. This is accomplished by installing TimberLOK Screws, which we happily provide.

These screws are hurricane ties – able to withstand the brunt force of harsh winds caused by severe storms. TimberLOK Screws keep trusses and roofs stable and secure during harsh weather conditions experienced on the plains of Kansas.

If you’re shopping for wood trusses in Kansas, then you can’t settle for average. Kansas’s prairie winds chew up average wood trusses and quickly reduce the lifespan of structures. If you’re looking for wood trusses in Kansas that offer a higher level of quality and longer-lasting support, then order from Timberlake TrussWorks today.

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Designing for Truss Deflection in Oklahoma

91370356268-mediumUnderstanding deflection within the design of trusses is one of the most important aspects when considering a truss system.
We spend considerable time determining the deflection, load amount and span of a truss. We review the specs again and again so our customers receive considerable spans, but spans that are deflected safety and effectively.

But first, let’s discuss the basics of deflection of our Oklahoma wood trusses a bit more:

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Preparing Wood Trusses for Oklahoma Wind

Oklahoma is notorious for strong winds at a moments notice. Whether a storm is brewing or it’s a beautiful day, wind is a considerable factor for building and construction experts to consider when developing within the plains of Oklahoma.

Just take a look at the power of wind in the state within the last year:

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