Increasing sound levels in a ringing room " I'm currently boarding up our lower louvres "
We had a local joinery workshop make us a set of large panels, each about 1 metre square - wide enough to span across the inside of the louvers. Each panel is about 75mm thick with a marine ply panel on either side and filled with 'rockwool' to absorb sound. The outer surface is lined with roofing felt.
We screwed 75x75mm undressed timber to the wall, at the top, bottom and at either side of the louver apertures and then screwed the panels to these battens.
The lowest of the panels covering each of the four appertures is hinged to open and allow the bells to be heard clearly on 'high days & holy days".
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We also installed baffle boards between the lower edge of one louver board and the top of the one below it. These stop birds from building nests in the sheltered nooks and crannies.
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They were fairly quick and easy to install and after almost 60 years and they show no signs of failing yet.