A construction site poses a particulate problem for many devices. Without spending a fortune on a case/housing that may or may not provide adequate function and added bulk, I would simply purchase a well made screen protector, stock or close to- leather pouch and be mindful of when you decide to take/make a call or utilize your device's apps...
Realistically, you may have to sit in your truck or walk behind a wall... Besides what is commonly available and has been discussed here, there really are not many more options available.
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