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Seattle      206-528-4670


Decay. Stability. Soil. We can test all, but we start with a Visual Tree Assessment from the ground. If further testing is necessary, there are several options for determining wood strength:

Increment Borer

Increment Borer:
manual instrument used to take thin core samples from trees for the purpose of detecting decay, staining, and assessing growth rings


Micro-resistance Recording Drill:
a drilling instrument used to determine the density of wood by measuring the amount of resistance presented to the drilling needle as it is driven into the tree. The drilling resistance profiles show clearly where compression wood, annual rings, decay in various stages, and other defects have been encountered by the drilling needle

View an example of resistance drill results


uses sound waves to detect the interior condition of a tree. By placing multiple sensors around a tree's trunk we can create 2-D and 3-D images of the internal structure.

View an example of tomography results

Pull Test

Pull Test:
also known as Static Integrated Assessment, measures the amount of compression and tension of wood at the base of a tree and movement at the roots by applying a predetermined load on the lever arm of the tree.

View our short video on pull tests

Soil Profile:
Using an auger system we can inspect your soil profile to determine how the existing conditions may be affecting your landscape. Soil is an essential component of tree health and stability. We can provide Soil Analysis to determine if your soil has deficiencies or excessive levels of particular elements and recommend an appropriate fertilization program for your sites needs. With the use of a tensiometer we can provide soil moisture analysis and monitoring.


Pole Test:
We have tested load bearing posts, power poles, and other wooden members with a resistograph to determine the extent of decay and the strength of a piece of wood.