You installed hardboard siding on our home in 2004. Now the siding is having problems. The caulking is separating at almost all seams on north side of house and some on the other 3 sides. The siding is also bulging in some places. What is the guarantee of this product which we believe should be at least 10-20 years, if not more. We await a call for you to come and look at the problem. 503-864-4572