Kitchen to garage fire door handles. Post your questions and get answers concerning many areas of this subject

[cheddar-man]

The handles on the fire door between our kitchen and garage are just about falling off. All the screws on both sides that hold the handles on have pulled out. I've tried screwing them back in but they won't grip. I tried longer/bigger screws but they just come up against something solid and won't hold.
How can I fix this please?
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[cheddar-man]

The handles on the fire door between our kitchen and garage are just about falling off. All the screws on both sides that hold the handles on have pulled out. I've tried screwing them back in but they won't grip. I tried longer/bigger screws but they just come up against something solid and won't hold.
How can I fix this please?