Insurance — Homeowners — Claim for water damage — Summary judgment — Where insurer moved for summary judgment in insureds’ action to recover for water damage to home based on affidavits and reports of experts who gave opinion that water damage was due to wear and tear and not covered by policy, and insureds responded by filing only part of an affidavit prepared by their expert, trial court properly entered summary judgment for defendant insurer — Insurer met its preliminary burden of showing that no issue of material fact existed, and insureds failed to meet their burden to come forward with counter-evidence sufficient to reveal a genuine issue, as their expert’s affidavit in truncated form contains only conclusions